tensorflow2.0学习记录-三种建模方式Three modeling methods

本篇blog介绍了tensorflow2.0的三种建模方式。

初学者建议前两种，学到后期强烈建议后一种，可以高度自定义。

顺序模型Sequential model

tf.keras.Sequential

就像搭积木一样，一层一层往上搭建。
第一种搭积木方式：

from tensorflow.keras import layers
import tensorflow as tf
model = tf.keras.Sequential()
model.add(layers.Dense(64, activation='relu'))#第一层
model.add(layers.Dense(64, activation='relu'))#第二层
model.add(layers.Dense(10))#第三层
#。。。未完待续

还有另外一种

model = tf.keras.Sequential([
layers.Dense(64, activation='relu', input_shape=(32,)),#第一层
layers.Dense(64, activation='relu'),#第二层
layers.Dense(10)#第三层
    #。。。。。全连接层
])

搭建好之后开始训练模型，定义损失函数，定义优化器，定义评估函数（可以不定义）。

model.compile(optimizer=tf.keras.optimizers.Adam(0.01),
              loss=tf.keras.losses.CategoricalCrossentropy(from_logits=True),
              metrics=['accuracy'])

import numpy as np

data = np.random.random((1000, 32))
labels = np.random.random((1000, 10))

model.fit(data, labels, epochs=10, batch_size=32)#开始训练model.fit()

Train on 1000 samples
Epoch 1/10
WARNING:tensorflow:Entity <function Function._initialize_uninitialized_variables.<locals>.initialize_variables at 0x000002CA715BB168> could not be transformed and will be executed as-is. Please report this to the AutoGraph team. When filing the bug, set the verbosity to 10 (on Linux, `export AUTOGRAPH_VERBOSITY=10`) and attach the full output. Cause: No module named 'tensorflow_core.estimator'
WARNING: Entity <function Function._initialize_uninitialized_variables.<locals>.initialize_variables at 0x000002CA715BB168> could not be transformed and will be executed as-is. Please report this to the AutoGraph team. When filing the bug, set the verbosity to 10 (on Linux, `export AUTOGRAPH_VERBOSI