pythonlessons

import tensorflow as tf
from keras import layers

# Define the discriminator model
def build_discriminator(img_shape, activation='linear', alpha=0.2):
    inputs = layers.Input(shape=img_shape, name="input")

    x = layers.Conv2D(64, (5, 5), strides=(2, 2), padding='same', use_bias=False)(inputs)
    x = layers.LeakyReLU(alpha)(x)

pythonlessons

import tensorflow as tf
from keras import layers

# Define the generator model
def build_generator(noise_dim, output_channels=3, activation="tanh", alpha=0.2):
    inputs = layers.Input(shape=noise_dim, name="input")

    x = layers.Dense(4*4*512, use_bias=False)(inputs)

    x = layers.Reshape((4, 4, 512))(x)

pythonlessons

# celebA dataset path
dataset_path = "Dataset/img_align_celeba"

# Set the input shape and size for the generator and discriminator
batch_size = 128
img_shape = (64, 64, 3) # The shape of the input image, input to the discriminator
noise_dim = 128 # The dimension of the noise vector, input to the generator
model_path = 'Models/02_WGANGP_faces'
os.makedirs(model_path, exist_ok=True)

pythonlessons

# Load MNIST dataset
(x_train, y_train), (x_test, y_test) = mnist.load_data()

# Normalize pixel values to [-1, 1]
x_train = (x_train.astype('float32') - 127.5) / 127.5 

# Set the input shape and size for the generator and discriminator
img_shape = (28, 28, 1) # The shape of the input image, input to the discriminator
noise_dim = 100 # The dimension of the noise vector, input to the generator
model_path = 'Models/01_GANs_introduction'

pythonlessons

class ResultsCallback(tf.keras.callbacks.Callback):
    """A callback that saves generated images after each epoch."""
    def __init__(
            self, 
            noise_dim: int, 
            results_path: str, 
            examples_to_generate: int=16, 
            grid_size: tuple=(4, 4), 
            spacing: int=5, 
            gif_size: tuple=(416, 416), 

pythonlessons

class GAN(tf.keras.models.Model):
    """A Generative Adversarial Network (GAN) implementation.

    This class inherits from `tf.keras.models.Model` and provides a
    straightforward implementation of the GAN algorithm.
    """
    def __init__(
            self, 
            discriminator: tf.keras.models.Model, 
            generator: tf.keras.models.Model, 

pythonlessons

def discriminator_loss(real_output, fake_output):
    real_loss = tf.keras.losses.BinaryCrossentropy(from_logits=True)(tf.ones_like(real_output), real_output)
    fake_loss = tf.keras.losses.BinaryCrossentropy(from_logits=True)(tf.zeros_like(fake_output), fake_output)
    total_loss = real_loss + fake_loss
    return total_loss

def generator_loss(fake_output):
    return tf.keras.losses.BinaryCrossentropy(from_logits=True)(tf.ones_like(fake_output), fake_output)

pythonlessons

import tensorflow as tf
from keras import layers

# Define the generator model
def build_generator(noise_dim):
    inputs = layers.Input(shape=noise_dim, name="input")

    x = layers.Dense(7*7*256, use_bias=False)(inputs)
    x = layers.BatchNormalization()(x)
    x = layers.LeakyReLU()(x)

pythonlessons

import tensorflow as tf
from tensorflow.keras.datasets import mnist

# Load MNIST dataset
(x_train, y_train), (x_test, y_test) = mnist.load_data()

# Normalize pixel values to [-1, 1]
x_train = (x_train.astype('float32') - 127.5) / 127.5 

pythonlessons

...
Image: Datasets/IAM_Words/words/b05/b05-017/b05-017-03-03.png, Label: won't, Prediction: won't, CER: 0.0
Image: Datasets/IAM_Words/words/a01/a01-049u/a01-049u-07-06.png, Label: session, Prediction: sessicn, CER: 0.14285714285714285
Image: Datasets/IAM_Words/words/a02/a02-000/a02-000-07-00.png, Label: but, Prediction: but, CER: 0.0
Image: Datasets/IAM_Words/words/m02/m02-087/m02-087-06-02.png, Label: as, Prediction: as, CER: 0.0
Image: Datasets/IAM_Words/words/g06/g06-037j/g06-037j-07-01.png, Label: his, Prediction: his, CER: 0.0
Image: Datasets/IAM_Words/words/g06/g06-047i/g06-047i-02-09.png, Label: human, Prediction: human, CER: 0.0
Image: Datasets/IAM_Words/words/c03/c03-094c/c03-094c-08-03.png, Label: gaudy, Prediction: gaudy, CER: 0.0
Image: Datasets/IAM_Words/words/e04/e04-132/e04-132-01-04.png, Label: on, Prediction: on, CER: 0.0
Image: Datasets/IAM_Words/words/k02/k02-018/k02-018-04-01.png, Label: surprised, Prediction: supised, CER: 0.2222222222222222