keras 多维输入到 simpleRNN:维度不匹配

Question

输入元素有 3 行，每行有 199 列，输出有 46 行和 1 列

Input.shape, output.shape
((204563, 3, 199), (204563, 46, 1))

当输入给定时，将引发以下错误：

from keras.layers import Dense
from keras.models import Sequential
from keras.layers.recurrent import SimpleRNN
model = Sequential()
model.add(SimpleRNN(100, input_shape = (Input.shape[1], Input.shape[2])))
model.add(Dense(output.shape[1], activation = 'softmax'))
model.compile(loss = 'categorical_crossentropy', optimizer = 'adam', metrics = ['accuracy'])
model.fit(Input, output, epochs = 20, batch_size = 200)

抛出错误：

Epoch 1/20
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-134-378dd431cf45> in <module>()
3 model.add(Dense(y_target.shape[1], activation = 'softmax'))
4 model.compile(loss = 'categorical_crossentropy', optimizer = 'adam', metrics = ['accuracy'])
----> 5 model.fit(X_input, y_target, epochs = 20, batch_size = 200)
.
.
.
ValueError: Error when checking model target: expected dense_6 to have 2 dimensions, but got array with shape (204563, 46, 1)

请解释问题的原因和可能的解释

Answer 1

问题是SimpleRNN(100)返回一个形状为(204563, 100)的张量，因此，Dense(46)(自output.shape[1]=46以来(将返回形状为(204563, 46)的张量，但你的y_target具有形状(204563, 46, 1)。例如，您需要删除最后一个维度，例如y_target = np.squeeze(y_target)，以便维度一致