基于路透社新闻报道主题分类任务,训练和评估一个简单的MLP(多层感知机)。
Keras实例目录
Keras使用的数据集下载(包含以下数据集)
MNIST
cifar-10-batches-py
imdb.npz、imdb_word_index.json
nietzsche.txt
reuters.npz
fra-eng
代码注释
'''Trains and evaluate a simple MLP
on the Reuters newswire topic classification task.
基于路透社新闻报道主题分类任务,训练和评估一个简单的MLP(多层感知机)。
MLP(Multi-Layer Perceptron),即多层感知器,是一种前向结构的人工神经网络,映射一组输入向量到一组输出向量。
MLP可以被看做是一个有向图,由多个节点层组成,每一层全连接到下一层。
'''
from __future__ import print_function
import numpy as np
import keras
from keras.datasets import reuters
from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation
from keras.preprocessing.text import Tokenizer
max_words = 1000
batch_size = 32
epochs = 5
print('Loading data...')
(x_train, y_train), (x_test, y_test) = reuters.load_data(num_words=max_words,
test_split=0.2)
print(len(x_train), 'train sequences')
print(len(x_test), 'test sequences')
num_classes = np.max(y_train) + 1
print(num_classes, 'classes')
print('Vectorizing sequence data...')
tokenizer = Tokenizer(num_words=max_words)
x_train = tokenizer.sequences_to_matrix(x_train, mode='binary')
x_test = tokenizer.sequences_to_matrix(x_test, mode='binary')
print('x_train shape:', x_train.shape)
print('x_test shape:', x_test.shape)
print('Convert class vector to binary class matrix '
'(for use with categorical_crossentropy)')
y_train = keras.utils.to_categorical(y_train, num_classes)
y_test = keras.utils.to_categorical(y_test, num_classes)
print('y_train shape:', y_train.shape)
print('y_test shape:', y_test.shape)
print('Building model...')
model = Sequential()
model.add(Dense(512, input_shape=(max_words,)))
model.add(Activation('relu'))
model.add(Dropout(0.5))
model.add(Dense(num_classes))
model.add(Activation('softmax'))
model.compile(loss='categorical_crossentropy',
optimizer='adam',
metrics=['accuracy'])
history = model.fit(x_train, y_train,
batch_size=batch_size,
epochs=epochs,
verbose=1,
validation_split=0.1)
score = model.evaluate(x_test, y_test,
batch_size=batch_size, verbose=1)
print('Test score:', score[0])
print('Test accuracy:', score[1])
代码执行
C:\ProgramData\Anaconda3\python.exe E:/keras-master/examples/reuters_mlp.py
Using TensorFlow backend.
Loading data...
8982 train sequences
2246 test sequences
46 classes
Vectorizing sequence data...
x_train shape: (8982, 1000)
x_test shape: (2246, 1000)
Convert class vector to binary class matrix (for use with categorical_crossentropy)
y_train shape: (8982, 46)
y_test shape: (2246, 46)
Building model...
Train on 8083 samples, validate on 899 samples
Epoch 1/5
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8083/8083 [==============================] - 6s 764us/step - loss: 1.4294 - acc: 0.6790 - val_loss: 1.0882 - val_acc: 0.7653
Epoch 2/5
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8083/8083 [==============================] - 5s 611us/step - loss: 0.7898 - acc: 0.8183 - val_loss: 0.9405 - val_acc: 0.7898
Epoch 3/5
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8083/8083 [==============================] - 5s 620us/step - loss: 0.5504 - acc: 0.8638 - val_loss: 0.8922 - val_acc: 0.7964
Epoch 4/5
32/8083 [..............................] - ETA: 4s - loss: 0.2811 - acc: 0.9375
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8083/8083 [==============================] - 5s 626us/step - loss: 0.4159 - acc: 0.8973 - val_loss: 0.8845 - val_acc: 0.8076
Epoch 5/5
32/8083 [..............................] - ETA: 5s - loss: 0.1721 - acc: 0.9688
128/8083 [..............................] - ETA: 4s - loss: 0.2283 - acc: 0.9531
224/8083 [..............................] - ETA: 4s - loss: 0.3462 - acc: 0.9152
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8064/8083 [============================>.] - ETA: 0s - loss: 0.3243 - acc: 0.9183
8083/8083 [==============================] - 5s 664us/step - loss: 0.3254 - acc: 0.9181 - val_loss: 0.9151 - val_acc: 0.7987
32/2246 [..............................] - ETA: 0s
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2246/2246 [==============================] - 0s 152us/step
Test score: 0.8895948799401654
Test accuracy: 0.7929652715939448
Process finished with exit code 0
Keras详细介绍
英文:https://keras.io/
中文:http://keras-cn.readthedocs.io/en/latest/
实例下载
https://github.com/keras-team/keras
https://github.com/keras-team/keras/tree/master/examples
完整项目下载
方便没积分童鞋,请加企鹅452205574,共享文件夹。
包括:代码、数据集合(图片)、已生成model、安装库文件等。