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Tensorflow La misma precisión de entrenamiento continúa

Question

Estoy atrapado en el modelo de CNN en Tensorflow. Mi código como a continuación.

Bibliotecas

# -*- coding: utf-8 -*-
import tensorflow as tf
import time
import json
import numpy as np
import matplotlib.pyplot as plt
import random
import multiprocessing as mp
import glob
import os

Modelo

def inference(images_placeholder, keep_prob):

    def weight_variable(shape):
        initial = tf.truncated_normal(shape, stddev=0.1)
        return tf.Variable(initial)

    def bias_variable(shape):
        initial = tf.constant(0.1, shape=shape)
        return tf.Variable(initial)

    # convolution
    def conv2d(x, W):
        return tf.nn.conv2d(x, W, strides=[1, 1, 1, 1], padding=''SAME'')

    # X2 pooling
    def max_pool_2x128(x):
        return tf.nn.max_pool(x, ksize=[1, 2, 1, 1],strides=[1, 2, 1, 1], padding=''VALID'')
    # X4 pooling
    def max_pool_4x128(x):
        return tf.nn.max_pool(x, ksize=[1, 4, 1, 1],strides=[1, 4, 1, 1], padding=''VALID'')

    x_image = tf.reshape(images_placeholder, [-1,599,1,128])

    #1st conv
    with tf.name_scope(''conv1'') as scope:
        W_conv1 = weight_variable([4, 1, 128, 256])
        b_conv1 = bias_variable([256])

        print "image変形後のshape"
        print tf.Tensor.get_shape(x_image)
        print "conv1の形"
        print tf.Tensor.get_shape(conv2d(x_image, W_conv1))

        h_conv1 = tf.nn.relu(conv2d(x_image, W_conv1) + b_conv1)

    #1st pooling X4
    with tf.name_scope(''pool1'') as scope:
        h_pool1 = max_pool_4x128(h_conv1)
        print "h_pool1の形"
        print tf.Tensor.get_shape(h_pool1)

    #2nd conv
    with tf.name_scope(''conv2'') as scope:
        W_conv2 = weight_variable([4, 1, 256, 256])
        b_conv2 = bias_variable([256])
        h_conv2 = tf.nn.relu(conv2d(h_pool1, W_conv2) + b_conv2)

    #2nd pooling X2
    with tf.name_scope(''pool2'') as scope:
        h_pool2 = max_pool_2x128(h_conv2)
        print "h_pool2の形"
        print tf.Tensor.get_shape(h_pool2)

    #3rd conv
    with tf.name_scope(''conv3'') as scope:
        W_conv3 = weight_variable([4, 1, 256, 512])
        b_conv3 = bias_variable([512])
        h_conv3 = tf.nn.relu(conv2d(h_pool2, W_conv3) + b_conv3)

    #3rd pooling X2
    with tf.name_scope(''pool3'') as scope:
        h_pool3 = max_pool_2x128(h_conv3)
        print "h_pool3の形"
        print tf.Tensor.get_shape(h_pool3)

    #flatten + 1st fully connected
    with tf.name_scope(''fc1'') as scope:
        W_fc1 = weight_variable([37 * 1 * 512, 2048])
        b_fc1 = bias_variable([2048])
        h_pool3_flat = tf.reshape(h_pool3, [-1, 37 * 1 * 512])
        h_fc1 = tf.nn.relu(tf.matmul(h_pool3_flat, W_fc1) + b_fc1)
        #ドロップ層の設定
        h_fc1_drop = tf.nn.dropout(h_fc1, keep_prob)

    #2nd fully connected
    with tf.name_scope(''fc2'') as scope:
        W_fc2 = weight_variable([2048, NUM_CLASSES])
        b_fc2 = bias_variable([NUM_CLASSES])

    #softmax output
    with tf.name_scope(''softmax'') as scope:
        y_conv=tf.nn.softmax(tf.matmul(h_fc1_drop, W_fc2) + b_fc2)

    return y_conv

Pérdida

def loss(logits, labels):
    # cross entropy
    cross_entropy = -tf.reduce_sum(labels*tf.log(tf.clip_by_value(logits,1e-10,1.0)))
    # TensorBoard
    tf.scalar_summary("cross_entropy", cross_entropy)
    return cross_entropy

Formación

def training(loss, learning_rate):
    train_step = tf.train.AdamOptimizer(learning_rate).minimize(loss)
    return train_step

Exactitud

def accuracy(logits, labels):
    correct_prediction = tf.equal(tf.argmax(logits, 1), tf.argmax(labels, 1))
    accuracy = tf.reduce_mean(tf.cast(correct_prediction, "float"))
    tf.scalar_summary("accuracy", accuracy)
    return accuracy

Principal

if __name__ == ''__main__'':

    flags = tf.app.flags
    FLAGS = flags.FLAGS

    flags.DEFINE_string(''train_dir'', ''/tmp/data'', ''Directory to put the training data.'')
    flags.DEFINE_integer(''max_steps'', , ''Number of steps to run trainer.'')
    flags.DEFINE_integer(''batch_size'', 10, ''Batch size''
                         ''Must divide evenly into the dataset sizes.'')
    flags.DEFINE_float(''learning_rate'', 1e-4, ''Initial learning rate.'')

    #num output
    NUM_CLASSES = 5
    #num frame
    IMAGE_SIZE = 599
    #tensor shape
    IMAGE_PIXELS = IMAGE_SIZE*1*128

    ##################
    #modify the data #
    ##################

    #number of training data
    train_num = 70
    #loading data limit
    data_limit = 100

    flatten_data = []
    flatten_label = []

    # データの整形
    filenames = glob.glob(os.path.join(''/Users/kosukefukui/Qosmo/WASABEAT/song_features/*.json''))
    filenames = filenames[0:data_limit]
    print "----loading data---"
    for file_path in filenames:
        data = json.load(open(file_path))
        data = np.array(data)

        for_flat = np.array(data)
        assert for_flat.flatten().shape == (IMAGE_PIXELS,)
        flatten_data.append(for_flat.flatten().tolist())

    # ラベルの整形
    f2 = open("id_information.txt")
    print "---loading labels----"

    for line in f2:
        line = line.rstrip()
        l = line.split(",")
        tmp = np.zeros(NUM_CLASSES)
        tmp[int(l[4])] = 1
        flatten_label.append(tmp)

    flatten_label = flatten_label[0:data_limit]

    print "データ数 %s" % len(flatten_data)
    print "ラベルデータ数 %s" % len(flatten_label)

    #train data
    train_image = np.asarray(flatten_data[0:train_num], dtype=np.float32)
    train_label = np.asarray(flatten_label[0:train_num],dtype=np.float32)

    print "訓練データ数 %s" % len(train_image)

    #test data
    test_image = np.asarray(flatten_data[train_num:data_limit], dtype=np.float32)
    test_label = np.asarray(flatten_label[train_num:data_limit],dtype=np.float32)

    print "テストデータ数 %s" % len(test_image)

    print "599×128 = "
    print len(train_image[0])

    f2.close()

    if 1==1:
        # Image Tensor
        images_placeholder = tf.placeholder("float", shape=(None, IMAGE_PIXELS))
        # Label Tensor
        labels_placeholder = tf.placeholder("float", shape=(None, NUM_CLASSES))
        # dropout Tensor
        keep_prob = tf.placeholder("float")

        # construct model
        logits = inference(images_placeholder, keep_prob)
        # calculate loss
        loss_value = loss(logits, labels_placeholder)
        # training
        train_op = training(loss_value, FLAGS.learning_rate)
        # accuracy
        acc = accuracy(logits, labels_placeholder)

        saver = tf.train.Saver()
        sess = tf.Session()
        sess.run(tf.initialize_all_variables())
        # for TensorBoard
        summary_op = tf.merge_all_summaries()
        summary_writer = tf.train.SummaryWriter(FLAGS.train_dir, sess.graph_def)

        # Training
        for step in range(FLAGS.max_steps):
            for i in range(len(train_image)/FLAGS.batch_size):
                # train for batch_size
                batch = FLAGS.batch_size*i
                sess.run(train_op, feed_dict={
                  images_placeholder: train_image[batch:batch+FLAGS.batch_size],
                  labels_placeholder: train_label[batch:batch+FLAGS.batch_size],
                  keep_prob: 0.5})

            # calculate accuracy at each step
            train_accuracy = sess.run(acc, feed_dict={
                images_placeholder: train_image,
                labels_placeholder: train_label,
                keep_prob: 1.0})
            print "step %d, training accuracy %g"%(step, train_accuracy)

            # add value for Tensorboard at each step
            summary_str = sess.run(summary_op, feed_dict={
                images_placeholder: train_image,
                labels_placeholder: train_label,
                keep_prob:1.0})
            summary_writer.add_summary(summary_str, step)

    # show accuracy for test data
    print "test accuracy %g"%sess.run(acc, feed_dict={
        images_placeholder: test_image,
        labels_placeholder: test_label,
        keep_prob: 1.0})
    # save the last model
    save_path = saver.save(sess, "model.ckpt")

Sin embargo, obtuve la misma precisión de entrenamiento. ¿Cómo arreglar este problema?

step 0, training accuracy 0.142857
step 1, training accuracy 0.142857
step 2, training accuracy 0.142857
step 3, training accuracy 0.142857
step 4, training accuracy 0.142857
step 5, training accuracy 0.142857
step 6, training accuracy 0.142857
step 7, training accuracy 0.142857
step 8, training accuracy 0.142857
step 9, training accuracy 0.142857
test accuracy 0.133333

Me referí al siguiente modelo y mi tensorboard es el siguiente.

Answer 1

¿Podría ser que no estás minimizando el tensor correcto? Está minimizando cross_entropy, pero debe ser cross_entropy_mean (precisión en su código).

Básicamente con la siguiente lógica:

cross_entropy = tf.nn.softmax_cross_entropy_with_logits (logits, ground_truth_placeholder)

cross_entropy_mean = tf.reduce_mean (cross_entropy)

train_step = tf.train.GradientDescentOptimizer (FLAGS.learning_rate) .minimize (cross_entropy_mean)