ValueError：检查输入时出错：预期embedding_1_input具有shape（4，）但得到的形状为数组（1，）

Question

我正在研究seq2seq翻译并被困在这里： -

def createModel(engVocab, frVocab, size, englishMaxlength, frenchMaxLength):
model = Sequential()
model.add(Embedding(input_dim = engVocab, output_dim = size, input_length = englishMaxlength, mask_zero = True))
model.add(LSTM(units = size))
model.add(RepeatVector(frenchMaxLength))
model.add(LSTM(units = size, return_sequences = True))
model.add(TimeDistributed(Dense(frenchVocabsize, activation = 'softmax')))
return model

def DataGenerator(trainingDataEnglish, trainingDataFrench):
    while True:
        l = len(trainingDataFrench)
        for i in range(l):
            yield(trainingDataEnglish[i], trainingDataFrench[i])

我创建了我的测试和训练数据如下： -

def encodeSequences(trainingData, tokenizer, maxlength):
encoder = tokenizer.texts_to_sequences(trainingData)
encoder = pad_sequences(encoder, maxlen=maxlength, padding='pre')
return encoder

def encodeOutput(testData, vocabSize):
y = []
for sequence in testData:
    Seq = to_categorical(sequence, num_classes=vocabSize)
    y.append(Seq)
y = np.array(y)
return y

samples = 7000
trainingSize = 6000
trainEng = english[:trainingSize] #array of strings
trainFr = french[:trainingSize] #array of strings
testEng = english[trainingSize:samples] #array of strings
testFr = french[trainingSize:samples] #array of strings
englishTokenizer = createTokenizer(trainEng)
frenchTokenizer = createTokenizer(trainFr)
englishVocabSize = len(englishTokenizer.word_index) + 1

encodeSequences和encodeOutput的使用如下： -

trainX = encodeSequences(trainEng, englishTokenizer, englishMaxlength)
trainY = encodeSequences(trainFr, frenchTokenizer, frenchMaxLength)
trainY = encodeOutput(trainY, frenchVocabsize)


testX = encodeSequences(testEng, englishTokenizer, englishMaxlength)
testY = encodeSequences(testFr, frenchTokenizer, frenchMaxLength)
testY = encodeOutput(testY, frenchVocabsize)

最后： -

model = createModel(engVocab = englishVocabSize, frVocab = frenchVocabsize, size = 256, englishMaxlength = englishMaxlength, frenchMaxLength = frenchMaxLength)
print(model.summary())
model.compile(optimizer = 'adam', loss = 'categorical_crossentropy')

steps = len(trainX)
generator = DataGenerator(trainX, trainY)
model.fit_generator(generator, epochs = epochs, steps_per_epoch = steps, validation_data = (testX, testY))
model.save('Model.h5')

我收到以下错误： -

ValueError: Error when checking input: expected embedding_1_input to have shape (4,) but got array with shape (1,)

我该如何解决这个问题？ 我哪里做错了？ 请帮忙。 提前谢谢。