（python）如何解决 ValueError: in user code:这个问题，亲们能解决一下吗？

原代码如下：

def define_model(vocad_size,max_length):
    model=Sequential()
    model.add(Embedding(vocad_size,100,input_length=max_length))
    model.add(Conv1D(filters=32,kernel_size=5,activation='relu'))
    model.add(MaxPooling1D(pool_size=2))
    model.add(Flatten())
    model.add(Dense(16,activation='relu'))
    model.add(Dense(8,activation='softmax'))
    model.compile(optimizer='adam', loss='categorical_crossentropy', metrics=['accuracy'])
    model.summary()
    return model

#模型训练
def model_train():
    model = define_model(vocad_size, max_length)
    model.fit(X_train, Y_train, epochs=10, verbose=2)
    model.save('词向量模型分类.h5')
    #model_train()#
model_train()