在构建 CNN 时，我收到来自 Keras 的抱怨，这些抱怨对我来说毫无意义. [英] When bulding a CNN, I am getting complaints from Keras that do not make sense to me.

问题描述

我的输入形状应该是 100x100.它代表一个句子.每个词是一个 100 维的向量，一个句子最多有 100 个词.

My input shape is supposed to be 100x100. It represents a sentence. Each word is a vector of 100 dimensions and there are 100 words at maximum in a sentence.

我向 CNN 输入了 8 个句子.我不确定这是否意味着我的输入形状应该改为 100x100x8.

I feed eight sentences to the CNN.I am not sure whether this means my input shape should be 100x100x8 instead.

然后是以下几行

Convolution2D(10, 3, 3, border_mode='same',
                       input_shape=(100, 100))

抱怨:

输入 0 与层卷积 2d_1 不兼容:预期 ndim=4，发现 ndim=3

Input 0 is incompatible with layer convolution2d_1: expected ndim=4, found ndim=3

这对我来说没有意义，因为我的输入维度是 2.我可以通过将 input_shape 更改为 (100,100,8) 来解决它.但是预期的 ndim=4"位对我来说没有意义.

This does not make sense to me as my input dimension is 2. I can get through it by changing input_shape to (100,100,8). But the "expected ndim=4" bit just does not make sense to me.

我也不明白为什么带有 10 个过滤器的 3x3 卷积层不接受 100x100 的输入.

I also cannot see why a convolution layer of 3x3 with 10 filters do not accept input of 100x100.

甚至我都解决了对预期的 ndim=4"的抱怨.我的激活层遇到了问题.它在那里抱怨:

Even I get thru the complains about the "expected ndim=4". I run into problem in my activation layer. There it complains:

不能将 softmax 应用于非 2D 或 3D 的张量.这里，ndim=4

Cannot apply softmax to a tensor that is not 2D or 3D. Here, ndim=4

谁能解释一下这里发生了什么以及如何解决?非常感谢.

Can anyone explain what is going on here and how to fix it? Many thanks.

推荐答案

我遇到了同样的问题，我解决了它，将 channel 的一维添加到 input_shape 参数.

I had the same problem and I solved it adding one dimension for channel to input_shape argument.

我建议以下解决方案:

Convolution2D(10, 3, 3, border_mode='same', input_shape=(100, 100, 1))

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