获取input_shape参数 LSTM 的形状

问：

有没有办法在 LSTM 中自动获取 input_shape 参数的形状，然后将该形状设置为input_shape参数。 我希望能够让递归神经网络根据数据的形状自动设置输入形状。 谢谢。

    dataset_train = pd.read_csv(dataset_path)
    
    training_set = dataset_train.iloc[:, :].values

    from sklearn.preprocessing import MinMaxScaler
    sc = MinMaxScaler(feature_range=(0, 1))
    training_set_scaled = sc.fit_transform(x)

    
    print(len(training_set_scaled))
    print(len(dataset_train))

    X_train = []
    y_train = []
    for i in range(past_days, len(training_set_scaled) - future_days + 1):
        X_train.append(training_set_scaled[i - past_days:i, 0])
        y_train.append(training_set_scaled[i + future_days - 1:i + future_days, 0])
    X_train, y_train = np.array(X_train), np.array(y_train)

    
    ## Building and Training the RNN

    from tensorflow.keras.models import Sequential
    from tensorflow.keras.layers import Dense
    from tensorflow.keras.layers import LSTM
    from tensorflow.keras.layers import Dropout

    ### Initialising the RNN


    regressor = Sequential()

    ### Adding the first LSTM layer and some Dropout regularisation

    regressor.add(LSTM(units=50, input_shape= (?) , return_sequences=True))
    regressor.add(Dropout(0.2))

    ### Adding a second LSTM layer and some Dropout regularisation

    regressor.add(LSTM(units=50, return_sequences=True))
    regressor.add(Dropout(0.2))

    ### Adding a third LSTM layer and some Dropout regularisation

    regressor.add(LSTM(units=50, return_sequences=True))
    regressor.add(Dropout(0.2))

    ### Adding a fourth LSTM layer and some Dropout regularisation

    regressor.add(LSTM(units=50))
    regressor.add(Dropout(0.2))

    ### Adding the output layer

    regressor.add(Dense(units=1))

    ### Compiling the RNN

    regressor.compile(optimizer='adam', loss='mean_squared_error')