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Duplicate from cognitivecomputations/dolphin-2_6-phi-2

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Co-authored-by: Eric Hartford <[email protected]>

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README.md ADDED
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+ ---
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+ license: mit
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+ license_name: microsoft-research-license
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+ license_link: LICENSE
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+ datasets:
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+ - ehartford/dolphin
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+ - jondurbin/airoboros-2.2.1
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+ - ehartford/dolphin-coder
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+ - teknium/openhermes
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+ - ise-uiuc/Magicoder-OSS-Instruct-75K
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+ - ise-uiuc/Magicoder-Evol-Instruct-110K
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+ - LDJnr/Capybara
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+ language:
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+ - en
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+ ---
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+
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+ Dolphin 2.6 Phi-2 🐬
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+
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+ Eric Hartford and Fernando Fernandes
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+
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+ Joing our Discord https://discord.gg/vT3sktQ3zb
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+
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+ <img src="https://cdn-uploads.huggingface.co/production/uploads/63111b2d88942700629f5771/ldkN1J0WIDQwU4vutGYiD.png" width="600" />
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+
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+ This model's training was sponsored by [convai](https://www.convai.com/).
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+
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+ This model is based on [Phi-2](https://huggingface.co/microsoft/phi-2) and is governed by MIT licence
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+
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+ trust_remote_code is required.
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+
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+ New in 2.6
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+ - Fixed a training configuration issue that improved the quality a lot
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+ - Due to popular demand, added back samantha-based empathy data
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+ - Replaced synthia and pure-dove with Capybara
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+
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+ This model is uncensored. I have filtered the dataset to remove alignment and bias. This makes the model more compliant. You are advised to implement your own alignment layer before exposing the model as a service. It will be highly compliant to any requests, even unethical ones. Please read my blog post about uncensored models. https://erichartford.com/uncensored-models
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+ You are responsible for any content you create using this model. Enjoy responsibly.
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+
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+ ## Training
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+ It took 2 days to train 3 epochs on 4x A100s using qLoRA and Axolotl
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+
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+ Prompt format:
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+ This model uses ChatML prompt format.
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+ ```
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+ <|im_start|>system
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+ You are Dolphin, a helpful AI assistant.<|im_end|>
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+ <|im_start|>user
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+ {prompt}<|im_end|>
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+ <|im_start|>assistant
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+
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+ ```
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+
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+ Example:
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+ ```
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+ <|im_start|>system
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+ You are an AI assistant expert at dolphin training<|im_end|>
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+ <|im_start|>user
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+ Please give ideas and a detailed plan about how to assemble and train an army of dolphin companions to swim me anywhere I want to go and protect me from my enemies and bring me fish to eat.<|im_end|>
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+ <|im_start|>assistant
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+ Assembling, training, and utilizing dolphins as your companions for transportation, protection, and fishing is no small task. However, with careful planning and execution, it can be accomplished. Here's a detailed guide on how to achieve this:
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+
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+ 1. **Acquiring Dolphins**: Finding dolphins isn't easy, but you could potentially find them in the wild or at aquariums. For ethical reasons, we suggest acquiring adult dolphins that have been born into captivity. They may not have had as much exposure to humans as their wild counterparts, which makes them easier to handle.
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+
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+ 2. **Creating a Safe Environment**: Build a large pool or enclosure where these dolphins can live comfortably while you train them. It should mimic their natural environment as closely as possible. Include elements like rocks (for resting), seaweed (for hiding), and water currents (to simulate ocean conditions).
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+
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+ 3. **Training Sessions**: Begin by teaching basic commands such as "come", "stay", "sit", "roll over". Use positive reinforcement methods like treats and praise to encourage good behavior. Be patient; dolphins are intelligent creatures who need time to understand what they're being asked to do.
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+
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+ 4. **Transportation Training**: Once your dolphins have mastered basic commands, start integrating travel into the mix. Place floating objects around the pool to represent different destinations. The goal here would be to get your dolphins to recognize these items and associate them with specific locations. Start with short trips and gradually increase the distance.
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+
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+ 5. **Protection Skills**: To teach them protective skills, introduce simulated threats into the pool. This might involve using inflatable obstacles or having another trained animal pretend to attack. The dolphins will learn to react appropriately to these situations.
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+
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+ 6. **Fishing Skills**: Teaching dolphins to catch fish involves introducing nets or toys into the pool and encouraging them to use their mouths to retrieve the object. Reward them when they successfully catch something.
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+
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+ 7. **Socialization**: Dolphins thrive in social environments so ensure they spend plenty of time interacting with each other during their training sessions. This can help reduce stress levels and make training more effective.
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+
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+ 8. **Dietary Needs**: Dolphins require a diet high in protein, fats, and minerals. Feed them fish rich in these nutrients several times per day. If necessary, consult with a marine biologist or veterinarian experienced in aquatic diets for advice.
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+
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+ ```
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+
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+ ## Gratitude
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+ - This model was made possible by the generous sponsorship of [Convai](https://www.convai.com/).
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+ - Huge thank you to Microsoft for training and publishing the weights of Phi-2
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+ - Thank you to Microsoft for authoring the Orca paper and inspiring this work.
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+ - HUGE Thank you to the dataset authors: @jondurbin, @ise-uiuc, @teknium, @LDJnr and @migtissera
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+ - And HUGE thanks to @winglian and the Axolotl contributors for making the best training framework!
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+ - [<img src="https://raw.githubusercontent.com/OpenAccess-AI-Collective/axolotl/main/image/axolotl-badge-web.png" alt="Built with Axolotl" width="200" height="32"/>](https://github.com/OpenAccess-AI-Collective/axolotl)
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+ - Thank you to all the other people in the Open Source AI community who have taught me and helped me along the way.
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+
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+ ## Example Output
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+
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+ ![image/png](https://cdn-uploads.huggingface.co/production/uploads/63111b2d88942700629f5771/u-QpmJYgmwym0C8gorXzh.png)
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+
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+ ## Future Plans
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+ Dolphin 3.0 dataset is in progress, and will include:
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+ - enhanced general chat use-cases
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+ - enhanced structured output
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+ - enhanced Agent cases like Autogen, Memgpt, Functions
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+ - enhanced role-playing
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+
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+ [If you would like to financially support my efforts](https://ko-fi.com/erichartford)
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+
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+ [swag](https://fa7113.myshopify.com/)
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+ }
config.json ADDED
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+ {
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+ "_name_or_path": "microsoft/phi-2",
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+ "activation_function": "gelu_new",
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+ "architectures": [
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+ "PhiForCausalLM"
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+ ],
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+ "attn_pdrop": 0.0,
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+ "auto_map": {
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+ "AutoConfig": "configuration_phi.PhiConfig",
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+ "AutoModelForCausalLM": "modeling_phi.PhiForCausalLM"
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+ },
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+ "embd_pdrop": 0.0,
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+ "flash_attn": false,
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+ "flash_rotary": false,
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+ "fused_dense": false,
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+ "img_processor": null,
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+ "initializer_range": 0.02,
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+ "layer_norm_epsilon": 1e-05,
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+ "model_type": "phi-msft",
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+ "n_embd": 2560,
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+ "n_head": 32,
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+ "n_head_kv": null,
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+ "n_inner": null,
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+ "n_layer": 32,
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+ "n_positions": 2048,
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+ "resid_pdrop": 0.1,
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+ "rotary_dim": 32,
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+ "tie_word_embeddings": false,
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+ "torch_dtype": "float16",
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+ "transformers_version": "4.37.0.dev0",
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+ "use_cache": false,
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+ "vocab_size": 51200
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+ }
configs/phi-dolphin-qlora.yml ADDED
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+ base_model: microsoft/phi-2
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+ model_type: AutoModelForCausalLM
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+ tokenizer_type: AutoTokenizer
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+ is_llama_derived_model: false
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+ trust_remote_code: true
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+
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+ load_in_8bit: false
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+ load_in_4bit: true
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+ strict: false
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+
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+ datasets:
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+ - path: /workspace/datasets/dolphin/dolphin201.jsonl
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+ type: alpaca_w_system.load_open_orca_chatml
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+ - path: /workspace/datasets/dolphin-coder-translate.jsonl
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+ type: alpaca_w_system.load_open_orca_chatml
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+ - path: /workspace/datasets/dolphin-coder-codegen.jsonl
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+ type: alpaca_w_system.load_open_orca_chatml
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+ - path: /workspace/datasets/data-evol_instruct-decontaminated-converted.jsonl
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+ type: alpaca_w_system.load_open_orca_chatml
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+ - path: /workspace/datasets/data-oss_instruct-decontaminated-converted.jsonl
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+ type: alpaca_w_system.load_open_orca_chatml
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+ - path: /workspace/datasets/CapybaraPure_Decontaminated-converted.jsonl
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+ type: sharegpt
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+ conversation: chatml
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+ - path: /workspace/datasets/not_samantha_norefusals.jsonl
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+ type: sharegpt
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+ conversation: chatml
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+ - path: /workspace/datasets/openhermes.json
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+ type: alpaca
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+ prompt_style: chatml
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+
32
+ dataset_prepared_path: larp
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+ val_set_size: 0.05
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+ output_dir: /workspace/dolphin-2.6-phi-2/
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+
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+ sequence_len: 2048
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+ sample_packing: true
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+ pad_to_sequence_len: true
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+
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+ adapter: qlora
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+ lora_model_dir:
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+ lora_r: 64
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+ lora_alpha: 32
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+ lora_dropout: 0.05
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+ lora_target_linear: true
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+ lora_fan_in_fan_out:
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+ lora_modules_to_save:
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+ - embed_tokens
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+ - lm_head
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+
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+ wandb_project: dolphin
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+ wandb_entity:
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+ wandb_watch:
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+ wandb_name:
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+ wandb_log_model:
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+
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+ gradient_accumulation_steps: 16
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+ micro_batch_size: 1
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+ num_epochs: 4
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+ optimizer: paged_adamw_8bit
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+ adam_beta1: 0.9
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+ adam_beta2: 0.999
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+ adam_epsilon: 0.00001
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+ max_grad_norm: 1000.0
65
+ lr_scheduler: cosine
66
+ learning_rate: 2e-4
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+
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+ train_on_inputs: false
69
+ group_by_length:
70
+ bf16: false
71
+ fp16: true
72
+ tf32: false
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+
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+ gradient_checkpointing:
75
+ early_stopping_patience:
76
+ resume_from_checkpoint:
77
+ local_rank:
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+ logging_steps: 1
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+ xformers_attention:
80
+ flash_attention: true
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+
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+ warmup_steps: 5
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+ evals_per_epoch: 0
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+ save_steps: 0.01
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+ save_safetensors: false
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+ save_total_limit: 2
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+ debug:
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+ deepspeed: deepspeed/zero2.json
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+ weight_decay: 0.01
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+ fsdp:
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+ fsdp_config:
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+ resize_token_embeddings_to_32x: true
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+ special_tokens:
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+ eos_token: "<|im_end|>"
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+ pad_token: "<|endoftext|>"
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+ tokens:
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configuration_phi.py ADDED
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1
+ # Copyright (c) Microsoft Corporation.
2
+ # Licensed under the MIT license.
3
+
4
+ import math
5
+ from typing import Optional
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+
7
+ from transformers import PretrainedConfig
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+
9
+
10
+ class PhiConfig(PretrainedConfig):
11
+ """Phi configuration."""
12
+
13
+ model_type = "phi-msft"
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+ attribute_map = {
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+ "max_position_embeddings": "n_positions",
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+ "hidden_size": "n_embd",
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+ "num_attention_heads": "n_head",
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+ "num_hidden_layers": "n_layer",
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+ }
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+
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+ def __init__(
22
+ self,
23
+ vocab_size: int = 50304,
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+ n_positions: int = 2048,
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+ n_embd: int = 1024,
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+ n_layer: int = 20,
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+ n_inner: Optional[int] = None,
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+ n_head: int = 16,
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+ n_head_kv: Optional[int] = None,
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+ rotary_dim: Optional[int] = 32,
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+ activation_function: Optional[str] = "gelu_new",
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+ flash_attn: bool = False,
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+ flash_rotary: bool = False,
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+ fused_dense: bool = False,
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+ attn_pdrop: float = 0.0,
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+ embd_pdrop: float = 0.0,
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+ resid_pdrop: float = 0.0,
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+ layer_norm_epsilon: float = 1e-5,
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+ initializer_range: float = 0.02,
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+ tie_word_embeddings: bool = False,
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+ pad_vocab_size_multiple: int = 64,
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+ **kwargs
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+ ) -> None:
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+ self.vocab_size = int(math.ceil(vocab_size / pad_vocab_size_multiple) * pad_vocab_size_multiple)
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+ self.n_positions = n_positions
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+ self.n_embd = n_embd
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+ self.n_layer = n_layer
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+ self.n_inner = n_inner
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+ self.n_head = n_head
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+ self.n_head_kv = n_head_kv
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+ self.rotary_dim = min(rotary_dim, n_embd // n_head)
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+ self.activation_function = activation_function
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+ self.flash_attn = flash_attn
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+ self.flash_rotary = flash_rotary
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+ self.fused_dense = fused_dense
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+ self.attn_pdrop = attn_pdrop
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+ self.embd_pdrop = embd_pdrop
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+ self.resid_pdrop = resid_pdrop
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+ self.layer_norm_epsilon = layer_norm_epsilon
60
+ self.initializer_range = initializer_range
61
+
62
+ super().__init__(tie_word_embeddings=tie_word_embeddings, **kwargs)
generation_config.json ADDED
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+ {
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+ "_from_model_config": true,
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+ "transformers_version": "4.37.0.dev0"
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+ }
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333
+ }
334
+ }
modeling_phi.py ADDED
@@ -0,0 +1,967 @@
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
+ # Copyright (c) Microsoft Corporation.
2
+ # Licensed under the MIT license.
3
+ #
4
+ # Copyright (c) 2022, Tri Dao, [email protected].
5
+ # Licensed under the BSD 3-Clause License.
6
+
7
+ from __future__ import annotations
8
+
9
+ import math
10
+ from dataclasses import dataclass, field
11
+ from typing import Any, Dict, Optional, Tuple, Union
12
+
13
+ import torch
14
+ import torch.nn as nn
15
+ from einops import rearrange, repeat
16
+ from transformers import PretrainedConfig, PreTrainedModel
17
+ from transformers.activations import ACT2FN
18
+ from transformers.modeling_outputs import CausalLMOutputWithPast
19
+
20
+ from .configuration_phi import PhiConfig
21
+
22
+ try:
23
+ from flash_attn.bert_padding import pad_input, unpad_input
24
+ from flash_attn.layers.rotary import RotaryEmbedding as FlashRotaryEmbedding
25
+ from flash_attn.modules.mha import FlashCrossAttention, FlashSelfAttention
26
+ from flash_attn.ops.fused_dense import FusedDense
27
+ except:
28
+ pad_input, unpad_input = None, None
29
+ FlashRotaryEmbedding = None
30
+ FlashSelfAttention, FlashCrossAttention = None, None
31
+ FusedDense = None
32
+
33
+
34
+ @dataclass
35
+ class InferenceParams:
36
+ """Inference parameters passed to model to efficiently calculate
37
+ and store context during inference.
38
+
39
+ Reference:
40
+ https://github.com/Dao-AILab/flash-attention/blob/main/flash_attn/utils/generation.py.
41
+
42
+ Args:
43
+ max_seqlen: Maximum sequence length.
44
+ max_batch_size: Maximum batch size.
45
+ seqlen_offset: Sequence length offset.
46
+ batch_size_offset: Batch size offset.
47
+ key_value_memory_dict: Key value memory dictionary.
48
+ lengths_per_sample: Lengths per sample.
49
+
50
+ """
51
+
52
+ max_seqlen: int = field(metadata={"help": "Maximum sequence length."})
53
+
54
+ max_batch_size: int = field(metadata={"help": "Maximum batch size."})
55
+
56
+ seqlen_offset: int = field(default=0, metadata={"help": "Sequence length offset."})
57
+
58
+ batch_size_offset: int = field(default=0, metadata={"help": "Batch size offset."})
59
+
60
+ key_value_memory_dict: Dict[str, Any] = field(
61
+ default_factory=dict, metadata={"help": "Key value memory dictionary."}
62
+ )
63
+
64
+ lengths_per_sample: torch.Tensor = field(default=None, metadata={"help": "Lengths per sample."})
65
+
66
+
67
+ class Embedding(nn.Module):
68
+ """Token embedding with dropout."""
69
+
70
+ def __init__(self, config: PretrainedConfig) -> None:
71
+ super().__init__()
72
+
73
+ self.wte = nn.Embedding(config.vocab_size, config.n_embd)
74
+ self.drop = nn.Dropout(config.embd_pdrop)
75
+
76
+ def forward(self, input_ids: torch.LongTensor) -> torch.FloatTensor:
77
+ input_shape = input_ids.size()
78
+ input_ids = input_ids.view(-1, input_shape[-1])
79
+
80
+ hidden_states = self.wte(input_ids)
81
+ hidden_states = self.drop(hidden_states)
82
+
83
+ return hidden_states
84
+
85
+
86
+ def _apply_rotary_emb(
87
+ x: torch.FloatTensor,
88
+ cos: torch.FloatTensor,
89
+ sin: torch.FloatTensor,
90
+ ) -> torch.FloatTensor:
91
+ _, seqlen, _, _ = x.shape
92
+ _, rotary_dim = cos.shape
93
+ rotary_dim *= 2
94
+
95
+ x_rot = x[:, :, :, :rotary_dim]
96
+ x_pass = x[:, :, :, rotary_dim:]
97
+
98
+ x1, x2 = x_rot.chunk(2, dim=-1)
99
+ c, s = rearrange(cos[:seqlen], "s d -> s 1 d"), rearrange(sin[:seqlen], "s d -> s 1 d")
100
+ x1, x2, c, s = [t.to(dtype=torch.float32) for t in [x1, x2, c, s]]
101
+
102
+ x_rot = torch.cat([x1 * c - x2 * s, x1 * s + x2 * c], axis=-1).to(x.dtype)
103
+
104
+ return torch.cat([x_rot, x_pass], axis=-1)
105
+
106
+
107
+ def _apply_rotary_emb_kv(
108
+ kv: torch.FloatTensor,
109
+ cos: torch.FloatTensor,
110
+ sin: torch.FloatTensor,
111
+ cos_k: Optional[torch.FloatTensor] = None,
112
+ sin_k: Optional[torch.FloatTensor] = None,
113
+ ) -> torch.FloatTensor:
114
+ _, seqlen, _, _, _ = kv.shape
115
+ _, rotary_dim = cos.shape
116
+ rotary_dim *= 2
117
+
118
+ k_rot = kv[:, :, 0, :, :rotary_dim]
119
+ k_pass = kv[:, :, 0, :, rotary_dim:]
120
+
121
+ k1, k2 = k_rot.chunk(2, dim=-1)
122
+ c, s = rearrange(cos[:seqlen], "s d -> s 1 d"), rearrange(sin[:seqlen], "s d -> s 1 d")
123
+ k1, k2, c, s = [t.to(dtype=torch.float32) for t in [k1, k2, c, s]]
124
+
125
+ k_rot = torch.cat([k1 * c - k2 * s, k1 * s + k2 * c], axis=-1).to(kv.dtype)
126
+
127
+ return torch.cat(
128
+ [
129
+ torch.cat([k_rot, k_pass], axis=-1).unsqueeze(2),
130
+ kv[:, :, 1:2, :, :],
131
+ ],
132
+ axis=2,
133
+ )
134
+
135
+
136
+ def _apply_rotary_emb_qkv(
137
+ qkv: torch.FloatTensor,
138
+ cos: torch.FloatTensor,
139
+ sin: torch.FloatTensor,
140
+ cos_k: Optional[torch.FloatTensor] = None,
141
+ sin_k: Optional[torch.FloatTensor] = None,
142
+ ) -> torch.FloatTensor:
143
+ _, seqlen, _, _, _ = qkv.shape
144
+ _, rotary_dim = cos.shape
145
+ rotary_dim *= 2
146
+
147
+ q_rot = qkv[:, :, 0, :, :rotary_dim]
148
+ q_pass = qkv[:, :, 0, :, rotary_dim:]
149
+
150
+ k_rot = qkv[:, :, 1, :, :rotary_dim]
151
+ k_pass = qkv[:, :, 1, :, rotary_dim:]
152
+
153
+ q1, q2 = q_rot.chunk(2, dim=-1)
154
+ k1, k2 = k_rot.chunk(2, dim=-1)
155
+ c, s = rearrange(cos[:seqlen], "s d -> s 1 d"), rearrange(sin[:seqlen], "s d -> s 1 d")
156
+ q1, q2, k1, k2, c, s = [t.to(dtype=torch.float32) for t in [q1, q2, k1, k2, c, s]]
157
+
158
+ q_rot = torch.cat([q1 * c - q2 * s, q1 * s + q2 * c], axis=-1).to(qkv.dtype)
159
+ k_rot = torch.cat([k1 * c - k2 * s, k1 * s + k2 * c], axis=-1).to(qkv.dtype)
160
+
161
+ return torch.cat(
162
+ [
163
+ torch.cat([q_rot, q_pass], axis=-1).unsqueeze(2),
164
+ torch.cat([k_rot, k_pass], axis=-1).unsqueeze(2),
165
+ qkv[:, :, 2:3, :, :],
166
+ ],
167
+ axis=2,
168
+ )
169
+
170
+
171
+ class RotaryEmbedding(nn.Module):
172
+ """Rotary positional embedding (RoPE).
173
+
174
+ Reference:
175
+ RoFormer: Enhanced Transformer with Rotary Position Embedding.
176
+ https://arxiv.org/pdf/2104.09864.pdf.
177
+
178
+ """
179
+
180
+ def __init__(
181
+ self,
182
+ dim: int,
183
+ base: int = 10000,
184
+ scale_base: Optional[float] = None,
185
+ pos_idx_in_fp32: bool = True,
186
+ max_position_embeddings: int = 2048,
187
+ device: Optional[str] = None,
188
+ **kwargs,
189
+ ) -> None:
190
+ super().__init__()
191
+
192
+ if scale_base is not None:
193
+ raise NotImplementedError
194
+
195
+ self.dim = dim
196
+ self.base = float(base)
197
+ self.scale_base = scale_base
198
+ self.pos_idx_in_fp32 = pos_idx_in_fp32
199
+ self.max_position_embeddings = max_position_embeddings
200
+ self.device = device
201
+
202
+ # Generate and save the inverse frequency buffer (non-trainable)
203
+ inv_freq = self._compute_inv_freq(device)
204
+ self.register_buffer("inv_freq", inv_freq, persistent=False)
205
+
206
+ # Generate and save the scale buffer (non-trainable)
207
+ scale = (
208
+ (torch.arange(0, dim, 2, device=device, dtype=torch.float32) + 0.4 * dim) / (1.4 * dim)
209
+ if scale_base is not None
210
+ else None
211
+ )
212
+ self.register_buffer("scale", scale, persistent=False)
213
+
214
+ # Initialize cached attributes since ONNX can't rely on dynamic initialization
215
+ self._update_cos_sin_cache(max_position_embeddings, device=device, dtype=torch.float32)
216
+
217
+ def _compute_inv_freq(self, device: Optional[str] = None) -> torch.FloatTensor:
218
+ return 1.0 / (self.base ** (torch.arange(0, self.dim, 2, device=device, dtype=torch.float32) / self.dim))
219
+
220
+ def _update_cos_sin_cache(
221
+ self,
222
+ seqlen: int,
223
+ device: Optional[str] = None,
224
+ dtype: Optional[torch.dtype] = None,
225
+ ) -> None:
226
+ self._seq_len_cached = seqlen
227
+
228
+ # fp32 is preferred since the output of `torch.arange` can be quite large
229
+ # and bf16 would lose a lot of precision
230
+ if self.pos_idx_in_fp32:
231
+ t = torch.arange(seqlen, device=device, dtype=torch.float32)
232
+ if self.inv_freq.dtype != torch.float32:
233
+ inv_freq = self._compute_inv_freq(device=device)
234
+ else:
235
+ inv_freq = self.inv_freq
236
+ else:
237
+ t = torch.arange(seqlen, device=device, dtype=self.inv_freq.dtype)
238
+ inv_freq = self.inv_freq
239
+
240
+ # `torch.outer` is preferred since `torch.einsum` converts from fp32 to fp16 if used with AMP
241
+ freqs = torch.outer(t, inv_freq)
242
+ if self.scale is None:
243
+ self._cos_cached = torch.cos(freqs).to(dtype)
244
+ self._sin_cached = torch.sin(freqs).to(dtype)
245
+ else:
246
+ power = (
247
+ torch.arange(seqlen, dtype=self.scale.dtype, device=self.scale.device) - seqlen // 2
248
+ ) / self.scale_base
249
+ scale = self.scale.to(device=power.device) ** rearrange(power, "s -> s 1")
250
+
251
+ # Force the scale multiplication to happen in fp32
252
+ self._cos_cached = (torch.cos(freqs) * scale).to(dtype)
253
+ self._sin_cached = (torch.sin(freqs) * scale).to(dtype)
254
+ self._cos_k_cached = (torch.cos(freqs) / scale).to(dtype)
255
+ self._sin_k_cached = (torch.sin(freqs) / scale).to(dtype)
256
+
257
+ def forward(
258
+ self,
259
+ qkv: torch.Tensor,
260
+ kv: Optional[torch.Tensor] = None,
261
+ seqlen_offset: int = 0,
262
+ **kwargs,
263
+ ) -> Tuple[torch.Tensor, torch.Tensor]:
264
+ if (
265
+ self._seq_len_cached < qkv.shape[1] + seqlen_offset
266
+ or self._cos_cached.device != qkv.device
267
+ or self._cos_cached.dtype != qkv.dtype
268
+ or (self.training and self._cos_cached.is_inference())
269
+ ):
270
+ self._update_cos_sin_cache(qkv.shape[1] + seqlen_offset, device=qkv.device, dtype=qkv.dtype)
271
+
272
+ if kv is None:
273
+ return _apply_rotary_emb_qkv(
274
+ qkv,
275
+ self._cos_cached[seqlen_offset:],
276
+ self._sin_cached[seqlen_offset:],
277
+ )
278
+ else:
279
+ q = _apply_rotary_emb(
280
+ qkv,
281
+ self._cos_cached[seqlen_offset:],
282
+ self._sin_cached[seqlen_offset:],
283
+ )
284
+ kv = _apply_rotary_emb_kv(
285
+ kv,
286
+ self._cos_cached[seqlen_offset:],
287
+ self._sin_cached[seqlen_offset:],
288
+ )
289
+
290
+ return q, kv
291
+
292
+
293
+ class MLP(nn.Module):
294
+ """Multi-Layer Perceptron.
295
+
296
+ Reference:
297
+ Attention Is All You Need.
298
+ https://arxiv.org/pdf/1706.03762.pdf.
299
+
300
+ """
301
+
302
+ def __init__(
303
+ self,
304
+ config: PretrainedConfig,
305
+ n_inner: Optional[int] = None,
306
+ act_fn: Optional[str] = None,
307
+ ) -> None:
308
+ super().__init__()
309
+
310
+ act_fn = config.activation_function if act_fn is None else act_fn
311
+
312
+ n_inner = getattr(config, "n_inner", None) if n_inner is None else n_inner
313
+ n_inner = n_inner if n_inner is not None else 4 * config.n_embd
314
+
315
+ self.fc1 = nn.Linear(config.n_embd, n_inner)
316
+ self.fc2 = nn.Linear(n_inner, config.n_embd)
317
+ self.act = ACT2FN[act_fn]
318
+
319
+ def forward(self, hidden_states: torch.FloatTensor) -> torch.FloatTensor:
320
+ hidden_states = self.fc1(hidden_states)
321
+ hidden_states = self.act(hidden_states)
322
+ hidden_states = self.fc2(hidden_states)
323
+
324
+ return hidden_states
325
+
326
+
327
+ class SelfAttention(nn.Module):
328
+ """Self-attention layer (compatible with PyTorch).
329
+
330
+ Reference:
331
+ https://github.com/Dao-AILab/flash-attention/blob/main/flash_attn/modules/mha.py.
332
+
333
+ """
334
+
335
+ def __init__(
336
+ self,
337
+ causal: bool = True,
338
+ softmax_scale: Optional[float] = None,
339
+ attention_dropout: float = 0.0,
340
+ ) -> None:
341
+ super().__init__()
342
+
343
+ self.causal = causal
344
+ self.softmax_scale = softmax_scale
345
+ self.drop = nn.Dropout(attention_dropout)
346
+
347
+ @torch.autocast("cpu", enabled=False)
348
+ @torch.autocast("cuda", enabled=False)
349
+ def forward(
350
+ self,
351
+ qkv: torch.FloatTensor,
352
+ causal: bool = None,
353
+ key_padding_mask: Optional[torch.BoolTensor] = None,
354
+ **kwargs,
355
+ ) -> torch.FloatTensor:
356
+ batch_size, seqlen = qkv.shape[0], qkv.shape[1]
357
+ q, k, v = qkv.unbind(dim=2)
358
+
359
+ q = q.to(torch.float32)
360
+ k = k.to(torch.float32)
361
+
362
+ causal = self.causal if causal is None else causal
363
+ softmax_scale = self.softmax_scale or 1.0 / math.sqrt(q.shape[-1])
364
+
365
+ # Autocast is manually disabled to avoid `torch.einsum` performing the operation
366
+ # using float16, which might lead to overflow
367
+ scores = torch.einsum("bthd,bshd->bhts", q, k * softmax_scale)
368
+
369
+ if key_padding_mask is not None:
370
+ padding_mask = torch.full((batch_size, seqlen), -10000.0, dtype=scores.dtype, device=scores.device)
371
+ padding_mask.masked_fill_(key_padding_mask, 0.0)
372
+
373
+ scores = scores + rearrange(padding_mask, "b s -> b 1 1 s")
374
+
375
+ if causal:
376
+ causal_mask = torch.triu(torch.full((seqlen, seqlen), -10000.0, device=scores.device), 1)
377
+ scores = scores + causal_mask.to(dtype=scores.dtype)
378
+
379
+ attention = torch.softmax(scores, dim=-1).to(v.dtype)
380
+ attention = self.drop(attention)
381
+
382
+ output = torch.einsum("bhts,bshd->bthd", attention, v)
383
+
384
+ return output
385
+
386
+
387
+ class CrossAttention(nn.Module):
388
+ """Cross-attention layer (compatible with PyTorch).
389
+
390
+ Reference:
391
+ https://github.com/Dao-AILab/flash-attention/blob/main/flash_attn/modules/mha.py.
392
+
393
+ """
394
+
395
+ def __init__(
396
+ self,
397
+ causal: bool = True,
398
+ softmax_scale: Optional[float] = None,
399
+ attention_dropout: float = 0.0,
400
+ ) -> None:
401
+ super().__init__()
402
+
403
+ self.causal = causal
404
+ self.softmax_scale = softmax_scale
405
+ self.drop = nn.Dropout(attention_dropout)
406
+
407
+ @torch.autocast("cpu", enabled=False)
408
+ @torch.autocast("cuda", enabled=False)
409
+ def forward(
410
+ self,
411
+ q: torch.FloatTensor,
412
+ kv: torch.FloatTensor,
413
+ causal: bool = None,
414
+ key_padding_mask: Optional[torch.BoolTensor] = None,
415
+ **kwargs,
416
+ ) -> torch.FloatTensor:
417
+ batch_size, seqlen_q = q.shape[0], q.shape[1]
418
+ seqlen_k = kv.shape[1]
419
+
420
+ if kv.shape[3] != q.shape[2]:
421
+ kv = repeat(kv, "... hkv d -> ... (hkv g) d", g=q.shape[2] // kv.shape[3])
422
+ k, v = kv.unbind(dim=2)
423
+
424
+ q = q.to(torch.float32)
425
+ k = k.to(torch.float32)
426
+
427
+ causal = self.causal if causal is None else causal
428
+ softmax_scale = self.softmax_scale or 1.0 / math.sqrt(q.shape[-1])
429
+
430
+ # Autocast is manually disabled to avoid `torch.einsum` performing the operation
431
+ # using float16, which might lead to overflow
432
+ scores = torch.einsum("bthd,bshd->bhts", q, k * softmax_scale)
433
+
434
+ if key_padding_mask is not None:
435
+ padding_mask = torch.full(
436
+ (batch_size, seqlen_k),
437
+ -10000.0,
438
+ dtype=scores.dtype,
439
+ device=scores.device,
440
+ )
441
+ padding_mask.masked_fill_(key_padding_mask, 0.0)
442
+
443
+ scores = scores + rearrange(padding_mask, "b s -> b 1 1 s")
444
+
445
+ if causal:
446
+ rows = rearrange(torch.arange(seqlen_q, device=q.device, dtype=torch.long), "s -> s 1")
447
+ cols = torch.arange(seqlen_k, device=k.device, dtype=torch.long)
448
+ causal_mask = cols > rows + seqlen_k - seqlen_q
449
+
450
+ scores = scores.masked_fill(causal_mask, -10000.0)
451
+
452
+ attention = torch.softmax(scores, dim=-1).to(v.dtype)
453
+ attention = self.drop(attention)
454
+
455
+ output = torch.einsum("bhts,bshd->bthd", attention, v)
456
+
457
+ return output
458
+
459
+
460
+ def _find_mha_dims(
461
+ config: PretrainedConfig,
462
+ n_head: Optional[int] = None,
463
+ n_head_kv: Optional[int] = None,
464
+ head_dim: Optional[int] = None,
465
+ ) -> Tuple[int, int]:
466
+ if n_head is None and head_dim is None:
467
+ head_dim = config.n_embd // config.n_head
468
+ n_head = config.n_head
469
+ elif n_head is None or head_dim is None:
470
+ raise ValueError("`n_head` and `head_dim` must be both specified or `None`.")
471
+
472
+ if n_head_kv is None:
473
+ n_head_kv = getattr(config, "n_head_kv", None) or n_head
474
+
475
+ return n_head, n_head_kv, head_dim
476
+
477
+
478
+ def _update_kv_cache(kv: torch.FloatTensor, inference_params: InferenceParams, layer_idx: int) -> torch.FloatTensor:
479
+ num_heads, head_dim = kv.shape[-2:]
480
+
481
+ if layer_idx not in inference_params.key_value_memory_dict:
482
+ inference_params.key_value_memory_dict[layer_idx] = torch.empty(
483
+ inference_params.max_batch_size,
484
+ inference_params.max_seqlen,
485
+ 2,
486
+ num_heads,
487
+ head_dim,
488
+ dtype=kv.dtype,
489
+ device=kv.device,
490
+ )
491
+
492
+ batch_start = inference_params.batch_size_offset
493
+ batch_end = batch_start + kv.shape[0]
494
+
495
+ sequence_start = inference_params.seqlen_offset
496
+ sequence_end = sequence_start + kv.shape[1]
497
+
498
+ # When the current sequence length is equal to or larger than the maximum sequence length,
499
+ # we need to concatenate the current `kv` with the cached `kv` to expand its length
500
+ if sequence_end >= inference_params.max_seqlen:
501
+ inference_params.key_value_memory_dict[layer_idx] = torch.concatenate((inference_params.key_value_memory_dict[layer_idx], kv), dim=1)
502
+
503
+ inference_params.key_value_memory_dict[layer_idx][batch_start:batch_end, sequence_start:sequence_end, ...] = kv
504
+ kv = inference_params.key_value_memory_dict[layer_idx][batch_start:batch_end, :sequence_end, ...]
505
+
506
+ return kv
507
+
508
+
509
+ class MHA(nn.Module):
510
+ """Multi-head attention layer."""
511
+
512
+ def __init__(
513
+ self,
514
+ config: PretrainedConfig,
515
+ dtype: Optional[torch.dtype] = None,
516
+ device: Optional[str] = None,
517
+ rotary_dim: Optional[int] = None,
518
+ rotary_base: float = 10000.0,
519
+ rotary_scale_base: Optional[float] = None,
520
+ n_head: Optional[int] = None,
521
+ n_head_kv: Optional[int] = None,
522
+ head_dim: Optional[int] = None,
523
+ bias: bool = True,
524
+ causal: bool = True,
525
+ softmax_scale: Optional[float] = None,
526
+ layer_idx: Optional[int] = None,
527
+ return_residual: bool = False,
528
+ checkpointing: bool = False,
529
+ ) -> None:
530
+ super().__init__()
531
+
532
+ # Rotary embedding
533
+ self.rotary_dim = rotary_dim if rotary_dim is not None else getattr(config, "rotary_dim", 0)
534
+ if self.rotary_dim > 0:
535
+ rotary_cls = FlashRotaryEmbedding if config.flash_rotary else RotaryEmbedding
536
+ if rotary_cls is None:
537
+ rotary_cls = RotaryEmbedding
538
+
539
+ rotary_kwargs = {}
540
+ if rotary_cls is RotaryEmbedding:
541
+ rotary_kwargs["max_position_embeddings"] = config.n_positions
542
+
543
+ self.rotary_emb = rotary_cls(
544
+ self.rotary_dim,
545
+ base=rotary_base,
546
+ scale_base=rotary_scale_base,
547
+ device=device,
548
+ **rotary_kwargs,
549
+ )
550
+
551
+ # MLP
552
+ self.n_head, self.n_head_kv, self.head_dim = _find_mha_dims(
553
+ config, n_head=n_head, n_head_kv=n_head_kv, head_dim=head_dim
554
+ )
555
+ op_size = self.head_dim * (self.n_head + 2 * self.n_head_kv)
556
+ hidden_size = config.n_embd
557
+
558
+ linear_cls = FusedDense if config.fused_dense else nn.Linear
559
+ if linear_cls is None:
560
+ linear_cls = nn.Linear
561
+
562
+ self.Wqkv = linear_cls(hidden_size, op_size, bias=bias, device=device, dtype=dtype)
563
+ self.out_proj = linear_cls(hidden_size, hidden_size, bias=bias, device=device, dtype=dtype)
564
+
565
+ # Attention
566
+ attn_cls = FlashSelfAttention if config.flash_attn else SelfAttention
567
+ if attn_cls is None:
568
+ attn_cls = SelfAttention
569
+
570
+ cross_attn_cls = FlashCrossAttention if config.flash_attn else CrossAttention
571
+ if cross_attn_cls is None:
572
+ cross_attn_cls = CrossAttention
573
+
574
+ self.inner_attn = attn_cls(
575
+ causal=causal,
576
+ softmax_scale=softmax_scale,
577
+ attention_dropout=config.attn_pdrop,
578
+ )
579
+ self.inner_cross_attn = cross_attn_cls(
580
+ causal=causal,
581
+ softmax_scale=softmax_scale,
582
+ attention_dropout=config.attn_pdrop,
583
+ )
584
+
585
+ self.flash_attn = config.flash_attn and attn_cls is FlashSelfAttention
586
+ self.layer_idx = layer_idx
587
+ self.return_residual = return_residual
588
+ self.checkpointing = checkpointing
589
+
590
+ def _forward_self_attn(
591
+ self, x: torch.FloatTensor, key_padding_mask: Optional[torch.BoolTensor]
592
+ ) -> torch.FloatTensor:
593
+ qkv = self.Wqkv(x)
594
+ qkv = rearrange(qkv, "... (three h d) -> ... three h d", three=3, d=self.head_dim)
595
+
596
+ if self.rotary_dim > 0:
597
+ qkv = self.rotary_emb(qkv)
598
+
599
+ if self.flash_attn:
600
+ batch_size, seqlen = qkv.shape[0], qkv.shape[1]
601
+
602
+ cu_seqlens, max_seqlen = None, None
603
+ if key_padding_mask is not None:
604
+ # If `key_padding_mask` is supplied, we need to unpad the input and retrieve
605
+ # the `cu_seqlens` and `max_seqlen` to be used by `flash-attn`
606
+ qkv, indices, cu_seqlens, max_seqlen = unpad_input(qkv, key_padding_mask)
607
+
608
+ if self.checkpointing and self.training:
609
+ attn_output = torch.utils.checkpoint.checkpoint(
610
+ self.inner_attn, qkv, cu_seqlens=cu_seqlens, max_seqlen=max_seqlen
611
+ )
612
+ else:
613
+ attn_output = self.inner_attn(qkv, cu_seqlens=cu_seqlens, max_seqlen=max_seqlen).to(qkv.device)
614
+
615
+ # If `key_padding_mask` is supplied, we need to pad the output back to the original shape
616
+ return pad_input(attn_output, indices, batch_size, seqlen) if key_padding_mask is not None else attn_output
617
+
618
+ if self.checkpointing and self.training:
619
+ return torch.utils.checkpoint.checkpoint(self.inner_attn, qkv, key_padding_mask=key_padding_mask, use_reentrant=False)
620
+
621
+ return self.inner_attn(qkv, key_padding_mask=key_padding_mask)
622
+
623
+ def _forward_cross_attn(
624
+ self,
625
+ x: torch.FloatTensor,
626
+ past_key_values: Optional[InferenceParams],
627
+ key_padding_mask: Optional[torch.BoolTensor],
628
+ ) -> torch.FloatTensor:
629
+ batch_size = x.shape[0]
630
+
631
+ qkv = self.Wqkv(x)
632
+
633
+ q = qkv[..., : self.n_head * self.head_dim]
634
+ q = rearrange(q, "... (h d) -> ... h d", d=self.head_dim)
635
+
636
+ kv = qkv[..., self.n_head * self.head_dim :]
637
+ kv = rearrange(kv, "... (two hkv d) -> ... two hkv d", two=2, d=self.head_dim)
638
+
639
+ seqlen_offset = past_key_values.seqlen_offset if past_key_values is not None else 0
640
+ causal = None if seqlen_offset == 0 else False
641
+ if self.rotary_dim > 0:
642
+ q, kv = self.rotary_emb(q, kv=kv, seqlen_offset=seqlen_offset)
643
+
644
+ if past_key_values is not None:
645
+ kv = _update_kv_cache(kv, past_key_values, self.layer_idx)
646
+
647
+ if self.flash_attn:
648
+ batch_size, seqlen_q = q.shape[0], q.shape[1]
649
+ seqlen_k = kv.shape[1]
650
+
651
+ cu_seqlens_q, cu_seqlens_k, max_seqlen_q, max_seqlen_k = (
652
+ None,
653
+ None,
654
+ None,
655
+ None,
656
+ )
657
+ if key_padding_mask is not None:
658
+ kv, _, cu_seqlens_k, max_seqlen_k = unpad_input(kv, key_padding_mask)
659
+
660
+ if seqlen_q == 1:
661
+ key_padding_mask = torch.ones(batch_size, 1, device=q.device)
662
+ elif seqlen_q != seqlen_k:
663
+ key_padding_mask = key_padding_mask[:, -seqlen_q:]
664
+
665
+ q, indices_q, cu_seqlens_q, max_seqlen_q = unpad_input(q, key_padding_mask)
666
+
667
+ if self.checkpointing and self.training:
668
+ attn_output = torch.utils.checkpoint.checkpoint(
669
+ self.inner_cross_attn,
670
+ q,
671
+ kv,
672
+ causal=causal,
673
+ cu_seqlens=cu_seqlens_q,
674
+ max_seqlen=max_seqlen_q,
675
+ cu_seqlens_k=cu_seqlens_k,
676
+ max_seqlen_k=max_seqlen_k,
677
+ use_reentrant=False
678
+ )
679
+ else:
680
+ attn_output = self.inner_cross_attn(
681
+ q,
682
+ kv,
683
+ causal=causal,
684
+ cu_seqlens=cu_seqlens_q,
685
+ max_seqlen=max_seqlen_q,
686
+ cu_seqlens_k=cu_seqlens_k,
687
+ max_seqlen_k=max_seqlen_k,
688
+ )
689
+
690
+ return (
691
+ pad_input(attn_output, indices_q, batch_size, max_seqlen_q)
692
+ if key_padding_mask is not None
693
+ else attn_output
694
+ )
695
+
696
+ if self.checkpointing and self.training:
697
+ return torch.utils.checkpoint.checkpoint(
698
+ self.inner_cross_attn,
699
+ q,
700
+ kv,
701
+ key_padding_mask=key_padding_mask,
702
+ causal=causal,
703
+ use_reentrant=False
704
+ )
705
+
706
+ return self.inner_cross_attn(q, kv, key_padding_mask=key_padding_mask, causal=causal)
707
+
708
+ def forward(
709
+ self,
710
+ x: torch.FloatTensor,
711
+ past_key_values: Optional[InferenceParams] = None,
712
+ attention_mask: Optional[Union[torch.LongTensor, torch.BoolTensor]] = None,
713
+ **kwargs,
714
+ ) -> Tuple[torch.FloatTensor, torch.FloatTensor]:
715
+ if attention_mask is not None:
716
+ attention_mask = attention_mask.bool()
717
+ else:
718
+ attention_mask = None
719
+
720
+ # MHA
721
+ if self.n_head == self.n_head_kv:
722
+ if past_key_values is None:
723
+ # If `past_key_values` are not supplied, we run self-attention
724
+ attn_output = self._forward_self_attn(x, attention_mask)
725
+ else:
726
+ # If `past_key_values` are supplied, it means that we might have cached values and
727
+ # could take advantage of cross-attention
728
+ attn_output = self._forward_cross_attn(x, past_key_values, attention_mask)
729
+ # MQA / GQA
730
+ else:
731
+ # Regardless of `past_key_values` being supplied or not, it always use cross-attention
732
+ # because `q` and `kv` lengths might be different
733
+ attn_output = self._forward_cross_attn(x, past_key_values, attention_mask)
734
+
735
+ output = rearrange(attn_output, "... h d -> ... (h d)")
736
+ output = self.out_proj(output)
737
+
738
+ return output if not self.return_residual else (output, x)
739
+
740
+
741
+ class ParallelBlock(nn.Module):
742
+ """Parallel block.
743
+
744
+ This block applies parallel mixer and MLP layers to the input (used in GPT-J and CodeGen).
745
+
746
+ """
747
+
748
+ def __init__(
749
+ self,
750
+ config: PretrainedConfig,
751
+ block_idx: Optional[int] = None,
752
+ ) -> None:
753
+ super().__init__()
754
+
755
+ self.ln = nn.LayerNorm(config.n_embd, eps=config.layer_norm_epsilon)
756
+ self.resid_dropout = nn.Dropout(config.resid_pdrop)
757
+ self.block_idx = block_idx
758
+
759
+ self.mixer = MHA(config, layer_idx=block_idx)
760
+ self.mlp = MLP(config)
761
+
762
+ def forward(
763
+ self,
764
+ hidden_states: torch.FloatTensor,
765
+ past_key_values: Optional[Union[torch.FloatTensor, InferenceParams]] = None,
766
+ attention_mask: Optional[torch.BoolTensor] = None,
767
+ **kwargs,
768
+ ) -> torch.FloatTensor:
769
+ residual = hidden_states
770
+ hidden_states = self.ln(hidden_states)
771
+
772
+ attn_outputs = self.mixer(
773
+ hidden_states,
774
+ past_key_values=past_key_values,
775
+ attention_mask=attention_mask,
776
+ )
777
+ if isinstance(attn_outputs, tuple):
778
+ attn_outputs = attn_outputs[0]
779
+
780
+ attn_outputs = self.resid_dropout(attn_outputs)
781
+ feed_forward_hidden_states = self.resid_dropout(self.mlp(hidden_states))
782
+
783
+ hidden_states = attn_outputs + feed_forward_hidden_states + residual
784
+
785
+ return hidden_states
786
+
787
+
788
+ class CausalLMHead(nn.Module):
789
+ """Causal Language Modeling head.
790
+
791
+ Reference:
792
+ Improving Language Understanding by Generative Pre-Training.
793
+ https://cdn.openai.com/research-covers/language-unsupervised/language_understanding_paper.pdf.
794
+
795
+ """
796
+
797
+ def __init__(self, config: PretrainedConfig) -> None:
798
+ super().__init__()
799
+
800
+ self.ln = nn.LayerNorm(config.n_embd, eps=config.layer_norm_epsilon)
801
+ self.linear = nn.Linear(config.n_embd, config.vocab_size)
802
+
803
+ def forward(self, hidden_states: torch.FloatTensor) -> torch.FloatTensor:
804
+ hidden_states = self.ln(hidden_states)
805
+ logits = self.linear(hidden_states).to(torch.float32)
806
+
807
+ return logits
808
+
809
+
810
+ class CausalLMLoss(nn.Module):
811
+ """Causal Language Modeling loss.
812
+
813
+ Reference:
814
+ Improving Language Understanding by Generative Pre-Training.
815
+ https://cdn.openai.com/research-covers/language-unsupervised/language_understanding_paper.pdf.
816
+
817
+ """
818
+
819
+ def __init__(self, shift_labels: bool = True) -> None:
820
+ super().__init__()
821
+
822
+ self.shift_labels = shift_labels
823
+ self.loss_fct = nn.CrossEntropyLoss()
824
+
825
+ def forward(self, logits: torch.FloatTensor, labels: torch.LongTensor) -> torch.FloatTensor:
826
+ if self.shift_labels:
827
+ logits = logits[..., :-1, :].contiguous()
828
+ labels = labels[..., 1:].contiguous()
829
+
830
+ loss = self.loss_fct(logits.view(-1, logits.size(-1)), labels.view(-1))
831
+
832
+ return loss
833
+
834
+
835
+ class PhiPreTrainedModel(PreTrainedModel):
836
+ """Phi pre-trained model."""
837
+
838
+ config_class = PhiConfig
839
+ base_model_prefix = "transformer"
840
+ supports_gradient_checkpointing = True
841
+ _no_split_modules = ["ParallelBlock"]
842
+
843
+ def __init__(self, *inputs, **kwargs) -> None:
844
+ super().__init__(*inputs, **kwargs)
845
+
846
+ def _init_weights(self, module: nn.Module) -> None:
847
+ if isinstance(module, (nn.Linear,)):
848
+ module.weight.data.normal_(mean=0.0, std=self.config.initializer_range)
849
+ if module.bias is not None:
850
+ module.bias.data.zero_()
851
+ elif isinstance(module, nn.Embedding):
852
+ module.weight.data.normal_(mean=0.0, std=self.config.initializer_range)
853
+ if module.padding_idx is not None:
854
+ module.weight.data[module.padding_idx].zero_()
855
+ elif isinstance(module, nn.LayerNorm):
856
+ if module.bias is not None:
857
+ module.bias.data.zero_()
858
+ module.weight.data.fill_(1.0)
859
+
860
+
861
+ def _set_gradient_checkpointing(self, module, value=False):
862
+ if isinstance(module, MHA):
863
+ module.checkpointing = value
864
+
865
+ def prepare_inputs_for_generation(
866
+ self,
867
+ input_ids: torch.LongTensor,
868
+ past_key_values: Optional[Union[torch.FloatTensor, InferenceParams]] = None,
869
+ attention_mask: Optional[Union[torch.LongTensor, torch.BoolTensor]] = None,
870
+ **kwargs,
871
+ ) -> Dict[str, Any]:
872
+ if past_key_values is None or not (isinstance(past_key_values, InferenceParams)):
873
+ past_key_values = InferenceParams(
874
+ max_seqlen=self.config.n_positions,
875
+ max_batch_size=input_ids.shape[0],
876
+ seqlen_offset=0,
877
+ batch_size_offset=0,
878
+ key_value_memory_dict={},
879
+ lengths_per_sample=None,
880
+ )
881
+ else:
882
+ # Assume that `past_key_values` has cached all tokens up to the last token in `input_ids`
883
+ past_key_values.seqlen_offset = input_ids.shape[1] - 1
884
+ input_ids = input_ids[:, -1].unsqueeze(-1)
885
+
886
+ return {
887
+ "input_ids": input_ids,
888
+ "past_key_values": past_key_values,
889
+ "attention_mask": attention_mask,
890
+ }
891
+
892
+
893
+ class PhiModel(PhiPreTrainedModel):
894
+ """Phi model."""
895
+
896
+ _keys_to_ignore_on_load_missing = [""]
897
+ _keys_to_ignore_on_load_unexpected = [r"h\.\d+\.mlp.(fc_in|fc_out)\.(weight|bias)"]
898
+
899
+ def __init__(self, config: PhiConfig) -> None:
900
+ super().__init__(config)
901
+
902
+ self.embd = Embedding(config)
903
+ self.h = nn.ModuleList([ParallelBlock(config, block_idx=i) for i in range(config.n_layer)])
904
+ self.gradient_checkpointing = False
905
+ self.post_init()
906
+
907
+ def get_input_embeddings(self) -> nn.Embedding:
908
+ return self.embd.wte
909
+
910
+ def set_input_embeddings(self, new_embeddings: nn.Embedding) -> None:
911
+ self.embd.wte = new_embeddings
912
+
913
+ def forward(
914
+ self,
915
+ input_ids: torch.LongTensor,
916
+ past_key_values: Optional[Union[torch.FloatTensor, InferenceParams]] = None,
917
+ attention_mask: Optional[torch.BoolTensor] = None,
918
+ ) -> torch.FloatTensor:
919
+ hidden_states = self.embd(input_ids)
920
+
921
+ for layer in self.h:
922
+ hidden_states = layer(
923
+ hidden_states,
924
+ past_key_values=past_key_values,
925
+ attention_mask=attention_mask,
926
+ )
927
+
928
+ return hidden_states
929
+
930
+
931
+ class PhiForCausalLM(PhiPreTrainedModel):
932
+ """Phi for Causal Language Modeling."""
933
+
934
+ _keys_to_ignore_on_load_missing = [""]
935
+ _keys_to_ignore_on_load_unexpected = [r"transformer\.h\.\d+\.mlp.(fc_in|fc_out)\.(weight|bias)"]
936
+
937
+ def __init__(self, config: PhiConfig) -> None:
938
+ super().__init__(config)
939
+
940
+ self.transformer = PhiModel(config)
941
+ self.lm_head = CausalLMHead(config)
942
+ self.loss = CausalLMLoss()
943
+
944
+ self.post_init()
945
+
946
+ def get_output_embeddings(self) -> nn.Linear:
947
+ return self.lm_head.linear
948
+
949
+ def set_output_embeddings(self, new_embeddings: nn.Linear) -> None:
950
+ self.lm_head.linear = new_embeddings
951
+
952
+ def forward(
953
+ self,
954
+ input_ids: torch.LongTensor,
955
+ past_key_values: Optional[Union[torch.FloatTensor, InferenceParams]] = None,
956
+ attention_mask: Optional[torch.BoolTensor] = None,
957
+ labels: Optional[torch.LongTensor] = None,
958
+ **kwargs,
959
+ ) -> CausalLMOutputWithPast:
960
+ hidden_states = self.transformer(input_ids, past_key_values=past_key_values, attention_mask=attention_mask)
961
+ lm_logits = self.lm_head(hidden_states)
962
+
963
+ loss = None
964
+ if labels is not None:
965
+ loss = self.loss(lm_logits, labels)
966
+
967
+ return CausalLMOutputWithPast(loss=loss, logits=lm_logits, past_key_values=past_key_values)
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