Question

我试图了解如何在Keras上编写Conv1D模型，但我一直遇到维数不匹配错误。现在x_train = [1000,294]（1000个项目和294个特征）和y_train = [1000,9]（1000个项目和9个标签）。我不断收到预期的错误消息3维，但有2维。但是我尝试修复它，它再次出现。 github上的一些问题建议使用Flatten()，但是它已经存在并且没有运气。知道我缺少什么吗？谢谢

我得到的错误

ValueError：输入0与层conv1d_1不兼容：预期 ndim = 3，找到的ndim = 2

代码包含在下面

tb = [keras.callbacks.TensorBoard(log_dir='./dllogs')]

main_input = Input(shape=(294, ), dtype='float32')

x_train = np.array(x_train)
y_train = np.array(y_train)

x_dev = np.array(x_dev)
y_dev = np.array(y_dev)
x = Conv1D(128, 5, activation='relu')(main_input)
x = MaxPooling1D(5)(x)
x = Conv1D(128, 5, activation='relu')(x)
x = MaxPooling1D(5)(x)
x = Conv1D(128, 5, activation='relu')(x)
x = MaxPooling1D(35)(x)
x = Flatten()(x)
x = Dropout(0.25)(x)
x = Dense(128, activation='relu')(x)

preds = Dense(pred_dim, activation='softmax')(x)
model = Model(inputs=main_input, outputs=preds)
model.compile(optimizer='adam', loss='kullback_leibler_divergence', metrics=['accuracy'])
print(model.summary())
history_NN = model.fit(x_train, y_train, batch_size=BATCHSIZE, epochs=EPOCHS, callbacks=tb, validation_data=(x_dev, y_dev))

答案

尺寸是一个引起麻烦的问题，今天的评论已解决了这个问题。
1. 接下来是合并的尺寸，这是合并后减小的尺寸，因此，在我进行了更改之后，整个事情在最终的合并中没有35张幻灯片。固定。

结果代码

tb = [keras.callbacks.TensorBoard(log_dir='./dllogs')]
main_input = Input(shape=(294, 1))#changed

x_train = np.array(x_train)
y_train = np.array(y_train)

x_dev = np.array(x_dev)
y_dev = np.array(y_dev)
x_train = np.expand_dims(x_train, axis=-1) #changed
x_dev = np.expand_dims(x_dev, axis=-1) #changed
x = Conv1D(128, 5, activation='relu')(main_input)
x = MaxPooling1D(5)(x)
x = Conv1D(128, 5, activation='relu')(x)
x = MaxPooling1D(5)(x)
x = Conv1D(128, 5, activation='relu')(x)
x = MaxPooling1D(11)(x)
x = Flatten()(x)
x = Dropout(0.25)(x)
x = Dense(128, activation='relu')(x)

preds = Dense(pred_dim, activation='softmax')(x)
model = Model(inputs=main_input, outputs=preds)
model.compile(optimizer='adam', loss='kullback_leibler_divergence', metrics=['accuracy'])
print(model.summary())
history_NN = model.fit(x_train, y_train, batch_size=BATCHSIZE, epochs=EPOCHS, callbacks=tb, validation_data=(x_dev, y_dev))

Answer 1

Conv1D层需要形状为(sequence_length, num_features)的序列输入。看来您的序列长度为294，具有 one 功能；因此，每个输入样本都需要具有(294,1)的形状（而不是(294,)）。要解决此问题，您可以使用np.expand_dims向输入数据添加大小为1的第三维：

x_train = np.expand_dims(x_train, axis=-1)
x_dev = np.expand_dims(x_dev, axis=-1)

main_input = Input(shape=(294, 1)) # fix the input shape here as well

keras中不兼容的输入数据错误，尺寸不匹配ValueError

1 个答案: