metadata

language:
  - en
thumbnail: null
tags:
  - text generation
  - instruct
pipeline_tag: text-generation
inference: false

Metharme 7B

An instruction-tuned LLaMA biased towards fiction writing and conversation.

Model Details

Metharme 7B is an instruct model based on Meta's LLaMA-7B.

This is an experiment to try and get a model that is usable for conversation, roleplaying and storywriting, but which can be guided using natural language like other instruct models. See the prompting section below for examples.

It was trained by doing supervised fine-tuning over a mixture of regular instruction data alongside roleplay, fictional stories and conversations with synthetically generated instructions attached.

Applying the XORs

The model weights in this repository cannot be used as-is. The files here are XORs due to licensing concerns. To obtain proper, usable model weights you need to:

Request access to the original LLaMA weights from Meta through this form
Convert them to the HuggingFace Transformers format by using the convert_llama_weights_to_hf.py script for your version of the transformers library

With the LLaMA-7B weights in hand, you can use the xor_codec.py script provided in this repository:

python3 xor_codec.py \
  ./metharme-7b \
  ./xor_encoded_files \
  /path/to/hf-converted/llama-7b \
  --decode

Note for Windows users: If you're on Windows, you might run into issues where following the steps above will result in corrupted files. This seems to be because git messes with the encoding of text files (so the .jsons and other relevant files). To avoid this, use WSL. For reference, these are the MD5 hashes you should get after following the steps above:

$ rhash -M *
4ad1977f59098f1b9dd022684f70e3d8  config.json
2917a1cafb895cf57e746cfd7696bfe5  generation_config.json
bbb197ca1ddcf6860676e837fcc83a2c  pytorch_model-00001-of-00002.bin
b174598f6c9587787156c473366c9903  pytorch_model-00002-of-00002.bin
81648ef3915ed2e83d49fed93122d53e  pytorch_model.bin.index.json
6b2e0a735969660e720c27061ef3f3d3  special_tokens_map.json
fdb311c39b8659a5d5c1991339bafc09  tokenizer.json
eeec4125e9c7560836b4873b6f8e3025  tokenizer.model
f0b65b44265ba51881b1e1881102504f  tokenizer_config.json

Prompting

The current model version has been trained on prompts using three different roles, which are denoted by the following tokens: <|system|>, <|user|> and <|model|>.

The <|system|> prompt can be used to inject out-of-channel information behind the scenes, while the <|user|> prompt should be used to indicate user input. The <|model|> token should then be used to indicate that the model should generate a response. These tokens can happen multiple times and be chained up to form a conversation history.

Prompting example

Here's a concrete example. Let's say you have the following system prompt:

This is a text adventure game. Describe the scenario to the user and give him three options to pick from on each turn.

And the user has typed in the following message:

Start!

To perform inference against the model, the prompt should be formatted like this:

<|system|>This is a text adventure game. Describe the scenario to the user and give him three options to pick from on each turn.<|user|>Start!<|model|>

The model might generate something like:

You are standing in front of an old, abandoned house. The windows are boarded up, and there's no sign of life around it. As you approach, you notice a strange feeling emanating from within. Suddenly, you hear a voice calling out to you... 'Come inside!'

Go inside the house.

Ignore the call and move away.

Run as fast as you can.

It will automatically emit an end-of-text token (</s>) when it judges that the response is complete.

Pretend then that the user has replied with go inside. The next prompt should then be:

<|system|>This is a text adventure game. Describe the scenario to the user and give him three options to pick from on each turn.<|user|>Start!<|model|>You are standing in front of an old, abandoned house. The windows are boarded up, and there's no sign of life around it. As you approach, you notice a strange feeling emanating from within. Suddenly, you hear a voice calling out to you... 'Come inside!'

- Go inside the house.
- Ignore the call and move away.
- Run as fast as you can.<|user|>go inside<|model|>

Which might generate something like:

You enter the house, and immediately, a wave of unsettling energy washes over you. Your senses seem heightened, but your mind feels foggy. A figure appears before you - a tall man with piercing eyes. He speaks to you in a language you don't understand.

Ask him what he wants.

Attack him.

Run away.

Same process applies. Usually, it is best to do a sliding window over the user and model turns, but keep the system prompt fixed at the start of the context window.

Limitations and biases

The intended use-case for this model is fictional writing for entertainment purposes. Any other sort of usage is out of scope.

As such, it was not fine-tuned to be safe and harmless: the base model and this fine-tune have been trained on data known to contain profanity and texts that are lewd or otherwise offensive. It may produce socially unacceptable or undesirable text, even if the prompt itself does not include anything explicitly offensive. Outputs might often be factually wrong or misleading.