NameError Traceback (most recent call last) <ipython-input-29-e60fd4208158> in <module> 47 return model 48 # lstm network ---> 49 model = create_LSTM_model(X_train) 50 # summary 51 print(model.summary()) <ipython-input-29-e60fd4208158> in create_LSTM_model(X_train) 13 # instantiate the model 14 model = Sequential() ---> 15 X_train = X_train.reshape((X_train.shape[0], n_steps, 1, n_length, n_features)) 16 model.add(Input(shape=(X_train.shape[1], X_train.shape[2]))) 17 NameError: name 'n_steps' is not defined

这个错误是因为在代码中使用了变量 `n_steps`，但是该变量没有被定义。你需要在代码中定义 `n_steps` 的值，例如：

n_steps = 4 # 定义时间步数为4

或者你可以在代码中查找是否有定义 `n_steps` 的代码，并确保其被正确执行。