# %%
import matplotlib.pyplot as plt
import tensorflow as tf
from tensorflow import keras

import numpy as np
print(tf.__version__)

# %%
imdb = keras.datasets.imdb
(train_data, train_labels), (test_data,
                             test_labels) = imdb.load_data(num_words=10000)

print('Train data shape: {}'.format(train_data.shape))
print('Train labels shape: {}'.format(train_labels.shape))
print('Train example: {}'.format(train_data[0]))
print('Train label example: {}'.format(train_labels[0]))

print('Test data shape: {}'.format(test_data.shape))
print('Test labels shape: {}'.format(test_labels.shape))

# %%
word_index = imdb.get_word_index()

# Push all words by 3 indexes because we want to put the first 3 for reserved words
word_index = {k: (v + 3) for k, v in word_index.items()}
word_index["<PAD>"] = 0
word_index["<START>"] = 1
word_index["<UNK>"] = 2
word_index["<UNUSED>"] = 3

reversed_word_index = dict([(value, key)
                            for (key, value) in word_index.items()])

def decode_review(text):
    return ' '.join([reversed_word_index.get(i, '?') for i in text])

decode_review(train_data[0])

# %%
train_data = keras.preprocessing.sequence.pad_sequences(train_data,
                                                        value=word_index["<PAD>"],
                                                        padding='post',
                                                        maxlen=256)

test_data = keras.preprocessing.sequence.pad_sequences(test_data,
                                                       value=word_index["<PAD>"],
                                                       padding='post',
                                                       maxlen=256)

# %%
len(train_data[0]), len(train_data[1])
print(train_data[0])

# %%
vocab_size = 10000
model = keras.Sequential()
model.add(keras.layers.Embedding(vocab_size, 16))
model.add(keras.layers.GlobalAveragePooling1D())
model.add(keras.layers.Dense(16, activation=tf.nn.relu))
model.add(keras.layers.Dense(1, activation=tf.nn.sigmoid))
model.summary()

# %%
model.compile(optimizer=tf.train.AdamOptimizer(),
              loss='binary_crossentropy',
              metrics=['accuracy'])

x_val = train_data[:10000]
partial_x_train = train_data[10000:]

y_val = train_labels[:10000]
partial_y_train = train_labels[10000:]

history = model.fit(partial_x_train,
                    partial_y_train,
                    epochs=40,
                    batch_size=512,
                    validation_data=(x_val, y_val),
                    verbose=1)

# %%
results = model.evaluate(test_data, test_labels)
print(results)

# %%
history_dict = history.history
history_dict.keys()


acc = history.history['acc']
val_acc = history.history['val_acc']
loss = history.history['loss']
val_loss = history.history['val_loss']

epochs = range(1, len(acc) + 1)

plt.plot(epochs, loss, 'bo', label='Training loss')
plt.plot(epochs, val_loss, 'b', label='Validation loss')
plt.title('Training and validation loss')
plt.xlabel('Epochs')
plt.ylabel('Loss')
plt.legend()

plt.show()

# %%
plt.clf()
acc_values = history_dict['acc']
val_acc_values = history_dict['val_acc']

plt.plot(epochs, acc_values, 'bo', label='Training acc')
plt.plot(epochs, val_acc_values, 'b', label='Validation acc')
plt.title('Training and validation accuracy')
plt.xlabel('Epochs')
plt.ylabel('Accuracy')
plt.legend()

plt.show()

# %%
import matplotlib.pyplot as plt
import tensorflow as tf
from tensorflow import keras

import numpy as np
print(tf.__version__)

# %%
imdb = keras.datasets.imdb
(train_data, train_labels), (test_data,
                             test_labels) = imdb.load_data(num_words=10000)

print('Train data shape: {}'.format(train_data.shape))
print('Train labels shape: {}'.format(train_labels.shape))
print('Train example: {}'.format(train_data[0]))
print('Train label example: {}'.format(train_labels[0]))

print('Test data shape: {}'.format(test_data.shape))
print('Test labels shape: {}'.format(test_labels.shape))

# %%
word_index = imdb.get_word_index()

# Push all words by 3 indexes because we want to put the first 3 for reserved words
word_index = {k: (v + 3) for k, v in word_index.items()}
word_index["<PAD>"] = 0
word_index["<START>"] = 1
word_index["<UNK>"] = 2
word_index["<UNUSED>"] = 3

reversed_word_index = dict([(value, key)
                            for (key, value) in word_index.items()])

def decode_review(text):
    return ' '.join([reversed_word_index.get(i, '?') for i in text])

decode_review(train_data[0])

# %%
train_data = keras.preprocessing.sequence.pad_sequences(train_data,
                                                        value=word_index["<PAD>"],
                                                        padding='post',
                                                        maxlen=256)

test_data = keras.preprocessing.sequence.pad_sequences(test_data,
                                                       value=word_index["<PAD>"],
                                                       padding='post',
                                                       maxlen=256)

# %%
len(train_data[0]), len(train_data[1])
print(train_data[0])

# %%
vocab_size = 10000
model = keras.Sequential()
model.add(keras.layers.Embedding(vocab_size, 16))
model.add(keras.layers.GlobalAveragePooling1D())
model.add(keras.layers.Dense(16, activation=tf.nn.relu))
model.add(keras.layers.Dense(1, activation=tf.nn.sigmoid))
model.summary()

# %%
model.compile(optimizer=tf.train.AdamOptimizer(),
              loss='binary_crossentropy',
              metrics=['accuracy'])

x_val = train_data[:10000]
partial_x_train = train_data[10000:]

y_val = train_labels[:10000]
partial_y_train = train_labels[10000:]

history = model.fit(partial_x_train,
                    partial_y_train,
                    epochs=40,
                    batch_size=512,
                    validation_data=(x_val, y_val),
                    verbose=1)

# %%
results = model.evaluate(test_data, test_labels)
print(results)

# %%
history_dict = history.history
history_dict.keys()


acc = history.history['acc']
val_acc = history.history['val_acc']
loss = history.history['loss']
val_loss = history.history['val_loss']

epochs = range(1, len(acc) + 1)

plt.plot(epochs, loss, 'bo', label='Training loss')
plt.plot(epochs, val_loss, 'b', label='Validation loss')
plt.title('Training and validation loss')
plt.xlabel('Epochs')
plt.ylabel('Loss')
plt.legend()

plt.show()

# %%
plt.clf()
acc_values = history_dict['acc']
val_acc_values = history_dict['val_acc']

plt.plot(epochs, acc_values, 'bo', label='Training acc')
plt.plot(epochs, val_acc_values, 'b', label='Validation acc')
plt.title('Training and validation accuracy')
plt.xlabel('Epochs')
plt.ylabel('Accuracy')
plt.legend()

plt.show()

# %% # %% # %% # Push all words by 3 indexes because we want to put the first 3 for reserved words # %% # %% # %% # %% # %% # %% # %%