Initial release

app.py

@@ -0,0 +1,624 @@
+# Huggingface.co UI Script
+# Using gradio to present a simple UI to select a random seed and generate an NFT
+
+import sys
+from subprocess import call
+def run_cmd(command):
+    try:
+        print(command)
+        call(command, shell=True)
+    except KeyboardInterrupt:
+        print("Process interrupted")
+        sys.exit(1)
+
+print("⬇️ Installing latest gradio==2.4.7b9")
+run_cmd("pip install --upgrade pip")
+run_cmd('pip install gradio==2.4.7b9')
+
+import gradio as gr
+import os
+import random
+import math
+import numpy as np
+import matplotlib.pyplot as plt
+
+from enum import Enum
+from glob import glob
+from functools import partial
+
+import tensorflow as tf
+from tensorflow import keras
+from tensorflow.keras import layers
+from tensorflow.keras.models import Sequential
+from tensorflow_addons.layers import InstanceNormalization
+
+import tensorflow_datasets as tfds
+
+# Model Definition
+
+def log2(x):
+    return int(np.log2(x))
+
+
+def resize_image(res, sample):
+    print("Call resize_image...")
+    image = sample["image"]
+    # only donwsampling, so use nearest neighbor that is faster to run
+    image = tf.image.resize(
+        image, (res, res), method=tf.image.ResizeMethod.NEAREST_NEIGHBOR
+    )
+    image = tf.cast(image, tf.float32) / 127.5 - 1.0
+    return image
+
+
+def create_dataloader(res):
+    batch_size = batch_sizes[log2(res)]
+    dl = ds_train.map(partial(resize_image, res), num_parallel_calls=tf.data.AUTOTUNE)
+    dl = dl.shuffle(200).batch(batch_size, drop_remainder=True).prefetch(1).repeat()
+    return dl
+
+def fade_in(alpha, a, b):
+    return alpha * a + (1.0 - alpha) * b
+
+
+def wasserstein_loss(y_true, y_pred):
+    return -tf.reduce_mean(y_true * y_pred)
+
+
+def pixel_norm(x, epsilon=1e-8):
+    return x / tf.math.sqrt(tf.reduce_mean(x ** 2, axis=-1, keepdims=True) + epsilon)
+
+
+def minibatch_std(input_tensor, epsilon=1e-8):
+    n, h, w, c = tf.shape(input_tensor)
+    group_size = tf.minimum(4, n)
+    x = tf.reshape(input_tensor, [group_size, -1, h, w, c])
+    group_mean, group_var = tf.nn.moments(x, axes=(0), keepdims=False)
+    group_std = tf.sqrt(group_var + epsilon)
+    avg_std = tf.reduce_mean(group_std, axis=[1, 2, 3], keepdims=True)
+    x = tf.tile(avg_std, [group_size, h, w, 1])
+    return tf.concat([input_tensor, x], axis=-1)
+
+
+class EqualizedConv(layers.Layer):
+    def __init__(self, out_channels, kernel=3, gain=2, **kwargs):
+        super(EqualizedConv, self).__init__(**kwargs)
+        self.kernel = kernel
+        self.out_channels = out_channels
+        self.gain = gain
+        self.pad = kernel != 1
+
+    def build(self, input_shape):
+        self.in_channels = input_shape[-1]
+        initializer = keras.initializers.RandomNormal(mean=0.0, stddev=1.0)
+        self.w = self.add_weight(
+            shape=[self.kernel, self.kernel, self.in_channels, self.out_channels],
+            initializer=initializer,
+            trainable=True,
+            name="kernel",
+        )
+        self.b = self.add_weight(
+            shape=(self.out_channels,), initializer="zeros", trainable=True, name="bias"
+        )
+        fan_in = self.kernel * self.kernel * self.in_channels
+        self.scale = tf.sqrt(self.gain / fan_in)
+
+    def call(self, inputs):
+        if self.pad:
+            x = tf.pad(inputs, [[0, 0], [1, 1], [1, 1], [0, 0]], mode="REFLECT")
+        else:
+            x = inputs
+        output = (
+            tf.nn.conv2d(x, self.scale * self.w, strides=1, padding="VALID") + self.b
+        )
+        return output
+
+
+class EqualizedDense(layers.Layer):
+    def __init__(self, units, gain=2, learning_rate_multiplier=1, **kwargs):
+        super(EqualizedDense, self).__init__(**kwargs)
+        self.units = units
+        self.gain = gain
+        self.learning_rate_multiplier = learning_rate_multiplier
+
+    def build(self, input_shape):
+        self.in_channels = input_shape[-1]
+        initializer = keras.initializers.RandomNormal(
+            mean=0.0, stddev=1.0 / self.learning_rate_multiplier
+        )
+        self.w = self.add_weight(
+            shape=[self.in_channels, self.units],
+            initializer=initializer,
+            trainable=True,
+            name="kernel",
+        )
+        self.b = self.add_weight(
+            shape=(self.units,), initializer="zeros", trainable=True, name="bias"
+        )
+        fan_in = self.in_channels
+        self.scale = tf.sqrt(self.gain / fan_in)
+
+    def call(self, inputs):
+        output = tf.add(tf.matmul(inputs, self.scale * self.w), self.b)
+        return output * self.learning_rate_multiplier
+
+
+class AddNoise(layers.Layer):
+    def build(self, input_shape):
+        n, h, w, c = input_shape[0]
+        initializer = keras.initializers.RandomNormal(mean=0.0, stddev=1.0)
+        self.b = self.add_weight(
+            shape=[1, 1, 1, c], initializer=initializer, trainable=True, name="kernel"
+        )
+
+    def call(self, inputs):
+        x, noise = inputs
+        output = x + self.b * noise
+        return output
+
+
+class AdaIN(layers.Layer):
+    def __init__(self, gain=1, **kwargs):
+        super(AdaIN, self).__init__(**kwargs)
+        self.gain = gain
+
+    def build(self, input_shapes):
+        x_shape = input_shapes[0]
+        w_shape = input_shapes[1]
+
+        self.w_channels = w_shape[-1]
+        self.x_channels = x_shape[-1]
+
+        self.dense_1 = EqualizedDense(self.x_channels, gain=1)
+        self.dense_2 = EqualizedDense(self.x_channels, gain=1)
+
+    def call(self, inputs):
+        x, w = inputs
+        ys = tf.reshape(self.dense_1(w), (-1, 1, 1, self.x_channels))
+        yb = tf.reshape(self.dense_2(w), (-1, 1, 1, self.x_channels))
+        return ys * x + yb
+
+def Mapping(num_stages, input_shape=512):
+    z = layers.Input(shape=(input_shape))
+    w = pixel_norm(z)
+    for i in range(8):
+        w = EqualizedDense(512, learning_rate_multiplier=0.01)(w)
+        w = layers.LeakyReLU(0.2)(w)
+    w = tf.tile(tf.expand_dims(w, 1), (1, num_stages, 1))
+    return keras.Model(z, w, name="mapping")
+
+
+class Generator:
+    def __init__(self, start_res_log2, target_res_log2):
+        self.start_res_log2 = start_res_log2
+        self.target_res_log2 = target_res_log2
+        self.num_stages = target_res_log2 - start_res_log2 + 1
+        # list of generator blocks at increasing resolution
+        self.g_blocks = []
+        # list of layers to convert g_block activation to RGB
+        self.to_rgb = []
+        # list of noise input of different resolutions into g_blocks
+        self.noise_inputs = []
+        # filter size to use at each stage, keys are log2(resolution)
+        self.filter_nums = {
+            0: 512,
+            1: 512,
+            2: 512,  # 4x4
+            3: 512,  # 8x8
+            4: 512,  # 16x16
+            5: 512,  # 32x32
+            6: 256,  # 64x64
+            7: 128,  # 128x128
+            8: 64,  # 256x256
+            9: 32,  # 512x512
+            10: 16,
+        }  # 1024x1024
+
+        start_res = 2 ** start_res_log2
+        self.input_shape = (start_res, start_res, self.filter_nums[start_res_log2])
+        self.g_input = layers.Input(self.input_shape, name="generator_input")
+
+        for i in range(start_res_log2, target_res_log2 + 1):
+            filter_num = self.filter_nums[i]
+            res = 2 ** i
+            self.noise_inputs.append(
+                layers.Input(shape=(res, res, 1), name=f"noise_{res}x{res}")
+            )
+            to_rgb = Sequential(
+                [
+                    layers.InputLayer(input_shape=(res, res, filter_num)),
+                    EqualizedConv(3, 1, gain=1),
+                ],
+                name=f"to_rgb_{res}x{res}",
+            )
+            self.to_rgb.append(to_rgb)
+            is_base = i == self.start_res_log2
+            if is_base:
+                input_shape = (res, res, self.filter_nums[i - 1])
+            else:
+                input_shape = (2 ** (i - 1), 2 ** (i - 1), self.filter_nums[i - 1])
+            g_block = self.build_block(
+                filter_num, res=res, input_shape=input_shape, is_base=is_base
+            )
+            self.g_blocks.append(g_block)
+
+    def build_block(self, filter_num, res, input_shape, is_base):
+        input_tensor = layers.Input(shape=input_shape, name=f"g_{res}")
+        noise = layers.Input(shape=(res, res, 1), name=f"noise_{res}")
+        w = layers.Input(shape=512)
+        x = input_tensor
+
+        if not is_base:
+            x = layers.UpSampling2D((2, 2))(x)
+            x = EqualizedConv(filter_num, 3)(x)
+
+        x = AddNoise()([x, noise])
+        x = layers.LeakyReLU(0.2)(x)
+        x = InstanceNormalization()(x)
+        x = AdaIN()([x, w])
+
+        x = EqualizedConv(filter_num, 3)(x)
+        x = AddNoise()([x, noise])
+        x = layers.LeakyReLU(0.2)(x)
+        x = InstanceNormalization()(x)
+        x = AdaIN()([x, w])
+        return keras.Model([input_tensor, w, noise], x, name=f"genblock_{res}x{res}")
+
+    def grow(self, res_log2):
+        res = 2 ** res_log2
+
+        num_stages = res_log2 - self.start_res_log2 + 1
+        w = layers.Input(shape=(self.num_stages, 512), name="w")
+
+        alpha = layers.Input(shape=(1), name="g_alpha")
+        x = self.g_blocks[0]([self.g_input, w[:, 0], self.noise_inputs[0]])
+
+        if num_stages == 1:
+            rgb = self.to_rgb[0](x)
+        else:
+            for i in range(1, num_stages - 1):
+
+                x = self.g_blocks[i]([x, w[:, i], self.noise_inputs[i]])
+
+            old_rgb = self.to_rgb[num_stages - 2](x)
+            old_rgb = layers.UpSampling2D((2, 2))(old_rgb)
+
+            i = num_stages - 1
+            x = self.g_blocks[i]([x, w[:, i], self.noise_inputs[i]])
+
+            new_rgb = self.to_rgb[i](x)
+
+            rgb = fade_in(alpha[0], new_rgb, old_rgb)
+
+        return keras.Model(
+            [self.g_input, w, self.noise_inputs, alpha],
+            rgb,
+            name=f"generator_{res}_x_{res}",
+        )
+
+
+class Discriminator:
+    def __init__(self, start_res_log2, target_res_log2):
+        self.start_res_log2 = start_res_log2
+        self.target_res_log2 = target_res_log2
+        self.num_stages = target_res_log2 - start_res_log2 + 1
+        # filter size to use at each stage, keys are log2(resolution)
+        self.filter_nums = {
+            0: 512,
+            1: 512,
+            2: 512,  # 4x4
+            3: 512,  # 8x8
+            4: 512,  # 16x16
+            5: 512,  # 32x32
+            6: 256,  # 64x64
+            7: 128,  # 128x128
+            8: 64,  # 256x256
+            9: 32,  # 512x512
+            10: 16,
+        }  # 1024x1024
+        # list of discriminator blocks at increasing resolution
+        self.d_blocks = []
+        # list of layers to convert RGB into activation for d_blocks inputs
+        self.from_rgb = []
+
+        for res_log2 in range(self.start_res_log2, self.target_res_log2 + 1):
+            res = 2 ** res_log2
+            filter_num = self.filter_nums[res_log2]
+            from_rgb = Sequential(
+                [
+                    layers.InputLayer(
+                        input_shape=(res, res, 3), name=f"from_rgb_input_{res}"
+                    ),
+                    EqualizedConv(filter_num, 1),
+                    layers.LeakyReLU(0.2),
+                ],
+                name=f"from_rgb_{res}",
+            )
+
+            self.from_rgb.append(from_rgb)
+
+            input_shape = (res, res, filter_num)
+            if len(self.d_blocks) == 0:
+                d_block = self.build_base(filter_num, res)
+            else:
+                d_block = self.build_block(
+                    filter_num, self.filter_nums[res_log2 - 1], res
+                )
+
+            self.d_blocks.append(d_block)
+
+    def build_base(self, filter_num, res):
+        input_tensor = layers.Input(shape=(res, res, filter_num), name=f"d_{res}")
+        x = minibatch_std(input_tensor)
+        x = EqualizedConv(filter_num, 3)(x)
+        x = layers.LeakyReLU(0.2)(x)
+        x = layers.Flatten()(x)
+        x = EqualizedDense(filter_num)(x)
+        x = layers.LeakyReLU(0.2)(x)
+        x = EqualizedDense(1)(x)
+        return keras.Model(input_tensor, x, name=f"d_{res}")
+
+    def build_block(self, filter_num_1, filter_num_2, res):
+        input_tensor = layers.Input(shape=(res, res, filter_num_1), name=f"d_{res}")
+        x = EqualizedConv(filter_num_1, 3)(input_tensor)
+        x = layers.LeakyReLU(0.2)(x)
+        x = EqualizedConv(filter_num_2)(x)
+        x = layers.LeakyReLU(0.2)(x)
+        x = layers.AveragePooling2D((2, 2))(x)
+        return keras.Model(input_tensor, x, name=f"d_{res}")
+
+    def grow(self, res_log2):
+        res = 2 ** res_log2
+        idx = res_log2 - self.start_res_log2
+        alpha = layers.Input(shape=(1), name="d_alpha")
+        input_image = layers.Input(shape=(res, res, 3), name="input_image")
+        x = self.from_rgb[idx](input_image)
+        x = self.d_blocks[idx](x)
+        if idx > 0:
+            idx -= 1
+            downsized_image = layers.AveragePooling2D((2, 2))(input_image)
+            y = self.from_rgb[idx](downsized_image)
+            x = fade_in(alpha[0], x, y)
+
+            for i in range(idx, -1, -1):
+                x = self.d_blocks[i](x)
+        return keras.Model([input_image, alpha], x, name=f"discriminator_{res}_x_{res}")
+
+class StyleGAN(tf.keras.Model):
+    def __init__(self, z_dim=512, target_res=64, start_res=4):
+        super(StyleGAN, self).__init__()
+        self.z_dim = z_dim
+
+        self.target_res_log2 = log2(target_res)
+        self.start_res_log2 = log2(start_res)
+        self.current_res_log2 = self.target_res_log2
+        self.num_stages = self.target_res_log2 - self.start_res_log2 + 1
+
+        self.alpha = tf.Variable(1.0, dtype=tf.float32, trainable=False, name="alpha")
+
+        self.mapping = Mapping(num_stages=self.num_stages)
+        self.d_builder = Discriminator(self.start_res_log2, self.target_res_log2)
+        self.g_builder = Generator(self.start_res_log2, self.target_res_log2)
+        self.g_input_shape = self.g_builder.input_shape
+
+        self.phase = None
+        self.train_step_counter = tf.Variable(0, dtype=tf.int32, trainable=False)
+
+        self.loss_weights = {"gradient_penalty": 10, "drift": 0.001}
+
+    def grow_model(self, res):
+        tf.keras.backend.clear_session()
+        res_log2 = log2(res)
+        self.generator = self.g_builder.grow(res_log2)
+        self.discriminator = self.d_builder.grow(res_log2)
+        self.current_res_log2 = res_log2
+        print(f"\nModel resolution:{res}x{res}")
+
+    def compile(
+        self, steps_per_epoch, phase, res, d_optimizer, g_optimizer, *args, **kwargs
+    ):
+        self.loss_weights = kwargs.pop("loss_weights", self.loss_weights)
+        self.steps_per_epoch = steps_per_epoch
+        if res != 2 ** self.current_res_log2:
+            self.grow_model(res)
+            self.d_optimizer = d_optimizer
+            self.g_optimizer = g_optimizer
+
+        self.train_step_counter.assign(0)
+        self.phase = phase
+        self.d_loss_metric = keras.metrics.Mean(name="d_loss")
+        self.g_loss_metric = keras.metrics.Mean(name="g_loss")
+        super(StyleGAN, self).compile(*args, **kwargs)
+
+    @property
+    def metrics(self):
+        return [self.d_loss_metric, self.g_loss_metric]
+
+    def generate_noise(self, batch_size):
+        noise = [
+            tf.random.normal((batch_size, 2 ** res, 2 ** res, 1))
+            for res in range(self.start_res_log2, self.target_res_log2 + 1)
+        ]
+        return noise
+
+    def gradient_loss(self, grad):
+        loss = tf.square(grad)
+        loss = tf.reduce_sum(loss, axis=tf.range(1, tf.size(tf.shape(loss))))
+        loss = tf.sqrt(loss)
+        loss = tf.reduce_mean(tf.square(loss - 1))
+        return loss
+
+    def train_step(self, real_images):
+
+        self.train_step_counter.assign_add(1)
+
+        if self.phase == "TRANSITION":
+            self.alpha.assign(
+                tf.cast(self.train_step_counter / self.steps_per_epoch, tf.float32)
+            )
+        elif self.phase == "STABLE":
+            self.alpha.assign(1.0)
+        else:
+            raise NotImplementedError
+        alpha = tf.expand_dims(self.alpha, 0)
+        batch_size = tf.shape(real_images)[0]
+        real_labels = tf.ones(batch_size)
+        fake_labels = -tf.ones(batch_size)
+
+        z = tf.random.normal((batch_size, self.z_dim))
+        const_input = tf.ones(tuple([batch_size] + list(self.g_input_shape)))
+        noise = self.generate_noise(batch_size)
+
+        # generator
+        with tf.GradientTape() as g_tape:
+            w = self.mapping(z)
+            fake_images = self.generator([const_input, w, noise, alpha])
+            pred_fake = self.discriminator([fake_images, alpha])
+            g_loss = wasserstein_loss(real_labels, pred_fake)
+
+            trainable_weights = (
+                self.mapping.trainable_weights + self.generator.trainable_weights
+            )
+            gradients = g_tape.gradient(g_loss, trainable_weights)
+            self.g_optimizer.apply_gradients(zip(gradients, trainable_weights))
+
+        # discriminator
+        with tf.GradientTape() as gradient_tape, tf.GradientTape() as total_tape:
+            # forward pass
+            pred_fake = self.discriminator([fake_images, alpha])
+            pred_real = self.discriminator([real_images, alpha])
+
+            epsilon = tf.random.uniform((batch_size, 1, 1, 1))
+            interpolates = epsilon * real_images + (1 - epsilon) * fake_images
+            gradient_tape.watch(interpolates)
+            pred_fake_grad = self.discriminator([interpolates, alpha])
+
+            # calculate losses
+            loss_fake = wasserstein_loss(fake_labels, pred_fake)
+            loss_real = wasserstein_loss(real_labels, pred_real)
+            loss_fake_grad = wasserstein_loss(fake_labels, pred_fake_grad)
+
+            # gradient penalty
+            gradients_fake = gradient_tape.gradient(loss_fake_grad, [interpolates])
+            gradient_penalty = self.loss_weights[
+                "gradient_penalty"
+            ] * self.gradient_loss(gradients_fake)
+
+            # drift loss
+            all_pred = tf.concat([pred_fake, pred_real], axis=0)
+            drift_loss = self.loss_weights["drift"] * tf.reduce_mean(all_pred ** 2)
+
+            d_loss = loss_fake + loss_real + gradient_penalty + drift_loss
+
+            gradients = total_tape.gradient(
+                d_loss, self.discriminator.trainable_weights
+            )
+            self.d_optimizer.apply_gradients(
+                zip(gradients, self.discriminator.trainable_weights)
+            )
+
+        # Update metrics
+        self.d_loss_metric.update_state(d_loss)
+        self.g_loss_metric.update_state(g_loss)
+        return {
+            "d_loss": self.d_loss_metric.result(),
+            "g_loss": self.g_loss_metric.result(),
+        }
+
+    def call(self, inputs: dict()):
+        style_code = inputs.get("style_code", None)
+        z = inputs.get("z", None)
+        noise = inputs.get("noise", None)
+        batch_size = inputs.get("batch_size", 1)
+        alpha = inputs.get("alpha", 1.0)
+        alpha = tf.expand_dims(alpha, 0)
+        if style_code is None:
+            if z is None:
+                z = tf.random.normal((batch_size, self.z_dim))
+            style_code = self.mapping(z)
+
+        if noise is None:
+            noise = self.generate_noise(batch_size)
+
+        # self.alpha.assign(alpha)
+
+        const_input = tf.ones(tuple([batch_size] + list(self.g_input_shape)))
+        images = self.generator([const_input, style_code, noise, alpha])
+        images = np.clip((images * 0.5 + 0.5) * 255, 0, 255).astype(np.uint8)
+
+        return images
+
+# Set up GAN
+
+batch_sizes = {2: 16, 3: 16, 4: 16, 5: 16, 6: 16, 7: 8, 8: 4, 9: 2, 10: 1}
+train_step_ratio = {k: batch_sizes[2] / v for k, v in batch_sizes.items()}
+
+START_RES = 4
+TARGET_RES = 128
+
+# style_gan = StyleGAN(start_res=START_RES, target_res=TARGET_RES)
+
+print("Loading...")
+
+url = "https://github.com/soon-yau/stylegan_keras/releases/download/keras_example_v1.0/stylegan_128x128.ckpt.zip"
+
+weights_path = keras.utils.get_file(
+    "stylegan_128x128.ckpt.zip",
+    url,
+    extract=True,
+    cache_dir=os.path.abspath("."),
+    cache_subdir="pretrained",
+)
+
+# style_gan.grow_model(128)
+# style_gan.load_weights(os.path.join("pretrained/stylegan_128x128.ckpt"))
+
+# tf.random.set_seed(196)
+# batch_size = 2
+# z = tf.random.normal((batch_size, style_gan.z_dim))
+# w = style_gan.mapping(z)
+# noise = style_gan.generate_noise(batch_size=batch_size)
+# images = style_gan({"style_code": w, "noise": noise, "alpha": 1.0})
+
+# plot_images(images, 5)
+
+class InferenceWrapper:
+    def __init__(self, model):
+        self.model = model
+        self.style_gan = StyleGAN(start_res=START_RES, target_res=TARGET_RES)
+        self.style_gan.grow_model(128)
+        self.style_gan.load_weights(os.path.join("pretrained/stylegan_128x128.ckpt"))
+        self.seed = -1
+
+    def __call__(self, seed, feature):
+        if seed != self.seed:
+            print(f"Loading model: {self.model}")
+            tf.random.set_seed(seed)
+            batch_size = 1
+            self.z = tf.random.normal((batch_size, self.style_gan.z_dim))
+            self.w = self.style_gan.mapping(self.z)
+            self.noise = self.style_gan.generate_noise(batch_size=batch_size)
+        else:
+            print(f"Model '{self.model}' already loaded, reusing it.")
+        return self.style_gan({"style_code": self.w, "noise": self.noise, "alpha": 1.0})[0]
+
+
+wrapper = InferenceWrapper('celeba')
+
+def fn(seed, feature):
+    return wrapper(seed, feature)
+
+gr.Interface(
+    fn,
+    inputs=[
+        gr.inputs.Slider(minimum=0, maximum=999999999, step=1, default=0, label='Random Seed'),
+        gr.inputs.Radio(list({"test1","test2"}), type="value", default='test1', label='Feature Type')
+    ],
+    outputs='image',
+    examples=[[343, 'test1'], [456, 'test2']],
+    enable_queue=True,
+    title="NFT GAN",
+    description="Select random seed and selct Submit to generate a new image",
+    article="<p>Face image generation with StyleGAN using tf.keras. The code is from the Keras.io <a class='moflo-link' href='https://keras.io/examples/generative/stylegan/'>exmple</a> by Soon-Yau Cheong</p>",
+    css=".panel { padding: 5px } .moflo-link { color: #999 }"
+).launch()

requirements.txt

@@ -0,0 +1,4 @@
+tensorflow
+tensorflow-datasets
+tensorflow-addons
+matplotlib