- #%%
- import tensorflow as tf
- from tensorflow import keras
- from tensorflow.keras import datasets, layers
- #%%
- def sigmoid(x): # sigmoid函数，也可以直接使用tf.nn.sigmoid
- return 1 / (1 + tf.math.exp(-x))
- def derivative(x): # sigmoid导数的计算
- return sigmoid(x)*(1-sigmoid(x))
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