SpatialDropout

Dropout()和SpatialDropout1D()的區別： 假設input_shape爲batch_size, timesteps, features, Dropout()，Dropout()是在全部數據上dropout，SpatialDropout1D()會按對features的某幾個維度進行dropout，如圖： 左圖：Dropout()， 右圖：SpatialDropout1D() 能

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