检查输入时出错：预期密集\u 1 \u输入有2个维度，但得到了形状为（25000、700、50）的数组

Question

trainData.shape=（25000700，50），形状如下：

[[[ 0.7095   0.863    0.712   ...  0.02715 -1.305    0.5195 ]
  [-0.66     1.715   -1.934   ...  0.5684   0.754    0.2593 ]
  [-0.3533   2.256   -1.292   ... -0.2708   0.6714  -1.128  ]
  ...
  [ 0.       0.       0.      ...  0.       0.       0.     ]
  [ 0.       0.       0.      ...  0.       0.       0.     ]
  [ 0.       0.       0.      ...  0.       0.       0.     ]]
  ...

trainLabel.shape=（25000，），形状如下：

[1. 1. 1. ... 0. 0. 0.]

使用它们来训练MLP模型，我应该如何重塑trainData和trainLabel？具体代码如下：

def MySimpleMLP(feature=700, vec_size=50):
    auc_roc = LSTM.as_keras_metric(tf.compat.v1.metrics.auc)

    model = Sequential()

    model.add(Dense(32, activation='relu', input_shape=(feature * vec_size,)))
    model.add(Dropout(0.2))
    model.add(Dense(32, activation='relu'))
    model.add(Dropout(0.2))
    model.add(Dense(1, activation='softmax'))

    model.compile(loss="binary_crossentropy", optimizer="adam", metrics=[auc_roc])
    return model

 ......       

 model.fit(trainData, trainLabel, validation_split=0.2, epochs=10, batch_size=64, verbose=2)

请救命

Answer 1

尝试添加Flatten层，如下所示：

def MySimpleMLP(feature=700, vec_size=50):
    auc_roc = LSTM.as_keras_metric(tf.compat.v1.metrics.auc)

    model = Sequential()

    model.add(Dense(32, activation='relu', input_shape=(feature * vec_size,)))
    model.add(Dropout(0.2))
    model.add(Dense(32, activation='relu'))
    model.add(Flatten())
    model.add(Dropout(0.2))
    model.add(Dense(1, activation='softmax'))

    model.compile(loss="binary_crossentropy", optimizer="adam", metrics=[auc_roc])
    return model

 ......       

 model.fit(trainData, trainLabel, validation_split=0.2, epochs=10, batch_size=64, verbose=2)

Flatten将（num\u of \u samples，64，32，32）数组转换为（num\u of \u samples，64*32*32）数组，即使数组变为2D，这正是您需要的