如何在 Keras 序列模型中提取偏置权重?

问题描述

我正在使用 Keras 运行一个简单的前馈网络.只有一个隐藏层，我想对每个输入与每个输出的相关性进行一些推断，我想提取权重.

I'm running a simple feed-forward network using Keras .Having just one hidden layer I would like to make some inference regarding the relevance of each input to each output and I would like to extract the weights.

这是模型:

def build_model(input_dim, output_dim):
    n_output_layer_1 = 150
    n_output = output_dim
    model = Sequential()
    model.add(Dense(n_output_layer_1, input_dim=input_dim, activation='relu'))
    model.add(Dropout(0.25))
    model.add(Dense(n_output))

提取我写的重量:

for layer in model.layers:
    weights = layer.get_weights()


weights = np.array(weights[0])     #this is hidden to output
first = model.layers[0].get_weights() #input to hidden
first = np.array(first[0])

不幸的是，我没有得到矩阵中的偏差列，我知道 Keras 会自动将其放入其中.

Unfortunately I don't get the biases columns in the matrices, which I know Keras automatically puts in it.

您知道如何检索偏差权重吗?

预先感谢您的帮助！

推荐答案

get_weights() 对于 Dense 层返回两个元素的列表，第一个元素包含权重，第二个元素包含偏差.所以你可以简单地做:

get_weights() for a Dense layer returns a list of two elements, the first element contains the weights, and the second element contains the biases. So you can simply do:

weights = model.layers[0].get_weights()[0]
biases = model.layers[0].get_weights()[1]

请注意，权重和偏差已经是 numpy 数组.

Note that weights and biases are already numpy arrays.

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