인공지능 구현에 대한 글입니다.

글의 순서는 아래와 같습니다.

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1.#lab-12-1-hello-rnn

 전 단계의 출력이 다음단계의 출력에 영향을 주는 경우 적용함

  - 단어, 연관검색등..

2. # lab-12-2-char-seq-rnn

  -rnn 적용  ==> 정확도 높음

    . 49 loss: 0.000650434 Prediction: if you want you

    . y값 if you want you

3.  #lab-12-3-char-seq-softmax-only

  rnn 미적용 ==> 정확도 미흡함

  2999 loss: 0.277323 Prediction: yf you yant you

  y값 if you want you

4. # lab-12-4-rnn_long_char

  error : from __future__ import print_function ==> 실행불가로 주석처리함

  MultiRNNCell 로 여러단을 만들면 , 정확도가 높아짐 

  softmax =>reshape 수행

6. 코드탐구(추가)

  ==>lab-12-5-rnn_stock_prediction

      lab-13-1-mnist_using_scope

      lab-13-2-mnist_tensorboard

      lab-13-3-mnist_save_restore

7. 참고자료

=================================================

[ #lab-12-1-hello-rnn ]

#lab-12-1-hello-rnn

"""

전 단계의 출력이 다음단계의 출력에 영향을 주는 경우 적용함

- 단어, 연관검색등..

"""

import os

os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3'

# Lab 12 RNN

import tensorflow as tf

import numpy as np

tf.set_random_seed(777)  # reproducibility

idx2char = ['h', 'i', 'e', 'l', 'o']

# Teach hello: hihell -> ihello

x_data = [[0, 1, 0, 2, 3, 3]]   # hihell

x_one_hot = [[[1, 0, 0, 0, 0],   # h 0

              [0, 1, 0, 0, 0],   # i 1

              [1, 0, 0, 0, 0],   # h 0

              [0, 0, 1, 0, 0],   # e 2

              [0, 0, 0, 1, 0],   # l 3

              [0, 0, 0, 1, 0]]]  # l 3

y_data = [[1, 0, 2, 3, 3, 4]]    # ihello

num_classes = 5

input_dim = 5  # one-hot size

hidden_size = 5  # output from the LSTM. 5 to directly predict one-hot

batch_size = 1   # one sentence

sequence_length = 6  # |ihello| == 6

learning_rate = 0.1

X = tf.placeholder(

    tf.float32, [None, sequence_length, input_dim])  # X one-hot

Y = tf.placeholder(tf.int32, [None, sequence_length])  # Y label

cell = tf.contrib.rnn.BasicLSTMCell(num_units=hidden_size, state_is_tuple=True)

initial_state = cell.zero_state(batch_size, tf.float32)

outputs, _states = tf.nn.dynamic_rnn(

    cell, X, initial_state=initial_state, dtype=tf.float32)

# FC layer

X_for_fc = tf.reshape(outputs, [-1, hidden_size])

# fc_w = tf.get_variable("fc_w", [hidden_size, num_classes])

# fc_b = tf.get_variable("fc_b", [num_classes])

# outputs = tf.matmul(X_for_fc, fc_w) + fc_b

outputs = tf.contrib.layers.fully_connected(

    inputs=X_for_fc, num_outputs=num_classes, activation_fn=None)

# reshape out for sequence_loss

outputs = tf.reshape(outputs, [batch_size, sequence_length, num_classes])

weights = tf.ones([batch_size, sequence_length])

sequence_loss = tf.contrib.seq2seq.sequence_loss(

    logits=outputs, targets=Y, weights=weights)

loss = tf.reduce_mean(sequence_loss)

train = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(loss)

prediction = tf.argmax(outputs, axis=2)

with tf.Session() as sess:

    sess.run(tf.global_variables_initializer())

    for i in range(50):

        l, _ = sess.run([loss, train], feed_dict={X: x_one_hot, Y: y_data})

        result = sess.run(prediction, feed_dict={X: x_one_hot})

        print(i, "loss:", l, "prediction: ", result, "true Y: ", y_data)

        # print char using dic

        result_str = [idx2char[c] for c in np.squeeze(result)]

        print("\tPrediction str: ", ''.join(result_str))

'''

0 loss: 1.71584 prediction:  [[2 2 2 3 3 2]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  eeelle

1 loss: 1.56447 prediction:  [[3 3 3 3 3 3]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  llllll

2 loss: 1.46284 prediction:  [[3 3 3 3 3 3]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  llllll

3 loss: 1.38073 prediction:  [[3 3 3 3 3 3]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  llllll

4 loss: 1.30603 prediction:  [[3 3 3 3 3 3]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  llllll

5 loss: 1.21498 prediction:  [[3 3 3 3 3 3]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  llllll

6 loss: 1.1029 prediction:  [[3 0 3 3 3 4]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  lhlllo

7 loss: 0.982386 prediction:  [[1 0 3 3 3 4]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  ihlllo

8 loss: 0.871259 prediction:  [[1 0 3 3 3 4]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  ihlllo

9 loss: 0.774338 prediction:  [[1 0 2 3 3 4]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  ihello

10 loss: 0.676005 prediction:  [[1 0 2 3 3 4]] true Y:  [[1, 0, 2, 3, 3, 4]]

Prediction str:  ihello

...

'''

[# lab-12-2-char-seq-rnn ]

# lab-12-2-char-seq-rnn

"""

rnn 적용  ==> 정확도 높음

 - 49 loss: 0.000650434 Prediction: if you want you

 - y값 if you want you

"""

import os

os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3'

# Lab 12 Character Sequence RNN

import tensorflow as tf

import numpy as np

tf.set_random_seed(777)  # reproducibility

sample = " if you want you"

idx2char = list(set(sample))  # index -> char

char2idx = {c: i for i, c in enumerate(idx2char)}  # char -> idex

# hyper parameters

dic_size = len(char2idx)  # RNN input size (one hot size)

hidden_size = len(char2idx)  # RNN output size

num_classes = len(char2idx)  # final output size (RNN or softmax, etc.)

batch_size = 1  # one sample data, one batch

sequence_length = len(sample) - 1  # number of lstm rollings (unit #)

learning_rate = 0.1

sample_idx = [char2idx[c] for c in sample]  # char to index

x_data = [sample_idx[:-1]]  # X data sample (0 ~ n-1) hello: hell

y_data = [sample_idx[1:]]   # Y label sample (1 ~ n) hello: ello

X = tf.placeholder(tf.int32, [None, sequence_length])  # X data

Y = tf.placeholder(tf.int32, [None, sequence_length])  # Y label

x_one_hot = tf.one_hot(X, num_classes)  # one hot: 1 -> 0 1 0 0 0 0 0 0 0 0

cell = tf.contrib.rnn.BasicLSTMCell(

    num_units=hidden_size, state_is_tuple=True)

initial_state = cell.zero_state(batch_size, tf.float32)

outputs, _states = tf.nn.dynamic_rnn(

    cell, x_one_hot, initial_state=initial_state, dtype=tf.float32)

# FC layer

X_for_fc = tf.reshape(outputs, [-1, hidden_size])

outputs = tf.contrib.layers.fully_connected(X_for_fc, num_classes, activation_fn=None)

# reshape out for sequence_loss

outputs = tf.reshape(outputs, [batch_size, sequence_length, num_classes])

weights = tf.ones([batch_size, sequence_length])

sequence_loss = tf.contrib.seq2seq.sequence_loss(

    logits=outputs, targets=Y, weights=weights)

loss = tf.reduce_mean(sequence_loss)

train = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(loss)

prediction = tf.argmax(outputs, axis=2)

with tf.Session() as sess:

    sess.run(tf.global_variables_initializer())

    for i in range(50):

        l, _ = sess.run([loss, train], feed_dict={X: x_data, Y: y_data})

        result = sess.run(prediction, feed_dict={X: x_data})

        # print char using dic

        result_str = [idx2char[c] for c in np.squeeze(result)]

        print(i, "loss:", l, "Prediction:", ''.join(result_str))

'''

0 loss: 2.35377 Prediction: uuuuuuuuuuuuuuu

1 loss: 2.21383 Prediction: yy you y    you

2 loss: 2.04317 Prediction: yy yoo       ou

3 loss: 1.85869 Prediction: yy  ou      uou

4 loss: 1.65096 Prediction: yy you  a   you

5 loss: 1.40243 Prediction: yy you yan  you

6 loss: 1.12986 Prediction: yy you wann you

7 loss: 0.907699 Prediction: yy you want you

8 loss: 0.687401 Prediction: yf you want you

9 loss: 0.508868 Prediction: yf you want you

10 loss: 0.379423 Prediction: yf you want you

11 loss: 0.282956 Prediction: if you want you

12 loss: 0.208561 Prediction: if you want you

...

'''

#lab-12-3-char-seq-softmax-only

"""

rnn 미적용 ==> 정확도 미흡함

 - 2999 loss: 0.277323 Prediction: yf you yant you

 - y값 if you want you

"""

import os

os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3'

# Lab 12 Character Sequence Softmax only

import tensorflow as tf

import numpy as np

tf.set_random_seed(777)  # reproducibility

sample = " if you want you"

idx2char = list(set(sample))  # index -> char

char2idx = {c: i for i, c in enumerate(idx2char)}  # char -> idex

# hyper parameters

dic_size = len(char2idx)  # RNN input size (one hot size)

rnn_hidden_size = len(char2idx)  # RNN output size

num_classes = len(char2idx)  # final output size (RNN or softmax, etc.)

batch_size = 1  # one sample data, one batch

sequence_length = len(sample) - 1  # number of lstm rollings (unit #)

learning_rate = 0.1

sample_idx = [char2idx[c] for c in sample]  # char to index

x_data = [sample_idx[:-1]]  # X data sample (0 ~ n-1) hello: hell

y_data = [sample_idx[1:]]   # Y label sample (1 ~ n) hello: ello

X = tf.placeholder(tf.int32, [None, sequence_length])  # X data

Y = tf.placeholder(tf.int32, [None, sequence_length])  # Y label

# flatten the data (ignore batches for now). No effect if the batch size is 1

X_one_hot = tf.one_hot(X, num_classes)  # one hot: 1 -> 0 1 0 0 0 0 0 0 0 0

X_for_softmax = tf.reshape(X_one_hot, [-1, rnn_hidden_size])

# softmax layer (rnn_hidden_size -> num_classes)

softmax_w = tf.get_variable("softmax_w", [rnn_hidden_size, num_classes])

softmax_b = tf.get_variable("softmax_b", [num_classes])

outputs = tf.matmul(X_for_softmax, softmax_w) + softmax_b

# expend the data (revive the batches)

outputs = tf.reshape(outputs, [batch_size, sequence_length, num_classes])

weights = tf.ones([batch_size, sequence_length])

# Compute sequence cost/loss

sequence_loss = tf.contrib.seq2seq.sequence_loss(

    logits=outputs, targets=Y, weights=weights)

loss = tf.reduce_mean(sequence_loss)  # mean all sequence loss

train = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(loss)

prediction = tf.argmax(outputs, axis=2)

with tf.Session() as sess:

    sess.run(tf.global_variables_initializer())

    for i in range(3000):

        l, _ = sess.run([loss, train], feed_dict={X: x_data, Y: y_data})

        result = sess.run(prediction, feed_dict={X: x_data})

        # print char using dic

        result_str = [idx2char[c] for c in np.squeeze(result)]

        print(i, "loss:", l, "Prediction:", ''.join(result_str))

'''

0 loss: 2.29513 Prediction: yu yny y y oyny

1 loss: 2.10156 Prediction: yu ynu y y oynu

2 loss: 1.92344 Prediction: yu you y u  you

..

2997 loss: 0.277323 Prediction: yf you yant you

2998 loss: 0.277323 Prediction: yf you yant you

2999 loss: 0.277323 Prediction: yf you yant you

'''

[# lab-12-4-rnn_long_char]

# lab-12-4-rnn_long_char

"""

error : from __future__ import print_function ==> 실행불가로 주석처리함

# MultiRNNCell 로 여러단을 만들면 , 정확도가 높아짐

# softmax =>reshape 수행

"""

import os

os.environ['TF_CPP_MIN_LOG_LEVEL'] = '3'

# from __future__ import print_function

import tensorflow as tf

import numpy as np

from tensorflow.contrib import rnn

tf.set_random_seed(777)  # reproducibility

sentence = ("if you want to build a ship, don't drum up people together to "

            "collect wood and don't assign them tasks and work, but rather "

            "teach them to long for the endless immensity of the sea.")

char_set = list(set(sentence))

char_dic = {w: i for i, w in enumerate(char_set)}

data_dim = len(char_set)

hidden_size = len(char_set)

num_classes = len(char_set)

sequence_length = 10  # Any arbitrary number

learning_rate = 0.1

dataX = []

dataY = []

for i in range(0, len(sentence) - sequence_length):

    x_str = sentence[i:i + sequence_length]

    y_str = sentence[i + 1: i + sequence_length + 1]

    print(i, x_str, '->', y_str)

    x = [char_dic[c] for c in x_str]  # x str to index

    y = [char_dic[c] for c in y_str]  # y str to index

    dataX.append(x)

    dataY.append(y)

batch_size = len(dataX)

X = tf.placeholder(tf.int32, [None, sequence_length])

Y = tf.placeholder(tf.int32, [None, sequence_length])

# One-hot encoding

X_one_hot = tf.one_hot(X, num_classes)

print(X_one_hot)  # check out the shape

# Make a lstm cell with hidden_size (each unit output vector size)

def lstm_cell():

    cell = rnn.BasicLSTMCell(hidden_size, state_is_tuple=True)

    return cell

multi_cells = rnn.MultiRNNCell([lstm_cell() for _ in range(2)], state_is_tuple=True)

# 위와 같이.MultiRNNCell 로 여러단을 만들면 , 정확도가 높아짐

# outputs: unfolding size x hidden size, state = hidden size

outputs, _states = tf.nn.dynamic_rnn(multi_cells, X_one_hot, dtype=tf.float32)

# softmax =>reshape 수행

# FC layer

X_for_fc = tf.reshape(outputs, [-1, hidden_size])

outputs = tf.contrib.layers.fully_connected(X_for_fc, num_classes, activation_fn=None)

# reshape out for sequence_loss

outputs = tf.reshape(outputs, [batch_size, sequence_length, num_classes])

# All weights are 1 (equal weights)

weights = tf.ones([batch_size, sequence_length])

sequence_loss = tf.contrib.seq2seq.sequence_loss(

    logits=outputs, targets=Y, weights=weights)

mean_loss = tf.reduce_mean(sequence_loss)

train_op = tf.train.AdamOptimizer(learning_rate=learning_rate).minimize(mean_loss)

sess = tf.Session()

sess.run(tf.global_variables_initializer())

for i in range(500):

    _, l, results = sess.run(

        [train_op, mean_loss, outputs], feed_dict={X: dataX, Y: dataY})

    for j, result in enumerate(results):

        index = np.argmax(result, axis=1)

        print(i, j, ''.join([char_set[t] for t in index]), l)

# Let's print the last char of each result to check it works

results = sess.run(outputs, feed_dict={X: dataX})

for j, result in enumerate(results):

    index = np.argmax(result, axis=1)

    if j is 0:  # print all for the first result to make a sentence

        print(''.join([char_set[t] for t in index]), end='')

    else:

        print(char_set[index[-1]], end='')

'''

0 167 tttttttttt 3.23111

0 168 tttttttttt 3.23111

0 169 tttttttttt 3.23111

…

499 167  of the se 0.229616

499 168 tf the sea 0.229616

499 169   the sea. 0.229616

g you want to build a ship, don't drum up people together to collect wood and don't assign them tasks and work, but rather teach them to long for the endless immensity of the sea.

'''

[# lab-12-5-rnn_stock_prediction]

[참고자료]

  https://www.inflearn.com/course/기본적인-머신러닝-딥러닝-강좌

  https://github.com/hunkim/deeplearningzerotoall

  https://www.tensorflow.org/api_docs/python/tf/layers