Comments (5)
I see. So it's not consistent with https://github.com/hunkim/DeepLearningZeroToAll/blob/master/lab-11-2-mnist_deep_cnn.py#L51
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@zeran4's issue is not about lowering the keep_prob to 0.3 from 0.7, but it's more like a confusing TensorFlow syntax.
In TensorFlow, there are two functions that perform the dropout
-
tf.layers.dropout
- If you look at the doc, it uses the "dropout" rate
- it behaves like MXNet
-
tf.contrib.layers.dropout
(same astf.nn.dropout
)- It uses the "keep_prob" rate
By dropout rate, I mean the ratio of nodes to be dropped
By keep_prob, I mean the ratio nodes to be kept
dropout rate = 1 - keep_prob
So,
In lab-11-4-mnist_cnn_layers.py, the rate should be changed to 0.3 from 0.7
because it uses tf.layers.dropout
and it uses the dropout rate
not the keep_prob
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@zeran4 I've tested these two scripts and in fact a keeping probability of 0.7 is correct. If we change the keeping probability to 0.3, too many nodes will be dropped and the performance will be quite bad.
You can refer to the implementation using MXNet https://github.com/hunkim/DeepLearningZeroToAll/blob/master/mxnet/mxlab-11-2-mnist_deep_cnn.py#L27
One more thing is that "dropout" is usually inserted before the FC layers and it's not standard to insert it before the Conv-Layers. The reason is that Conv-Layers already have local sparse connection structures and are less prone to overfitting. Nevertheless, it's okay to use it in the scripts for demonstration.
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In the file DeepLearningZeroToAll/lab-10-5-mnist_nn_dropout.py, we have this problem too
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