Question

我正在运行keras over tensorflow，尝试实现多维LSTM网络来预测线性连续目标变量，每个示例的单个值（return_sequences = False）。我的序列长度为10，特征数（dim）为11。这就是我的目的：

import pprint, pickle
import numpy as np
from keras.models import Sequential
from keras.layers import Dense, Activation
from keras.layers import LSTM

# Input sequence
wholeSequence = [[0,0,0,0,0,0,0,0,0,2,1],
                 [0,0,0,0,0,0,0,0,2,1,0],
                 [0,0,0,0,0,0,0,2,1,0,0],
                 [0,0,0,0,0,0,2,1,0,0,0],
                 [0,0,0,0,0,2,1,0,0,0,0],
                 [0,0,0,0,2,1,0,0,0,0,0],
                 [0,0,0,2,1,0,0,0,0,0,0],
                 [0,0,2,1,0,0,0,0,0,0,0],
                 [0,2,1,0,0,0,0,0,0,0,0],
                 [2,1,0,0,0,0,0,0,0,0,0]]

# Preprocess Data:
wholeSequence = np.array(wholeSequence, dtype=float) # Convert to NP array.
data = wholeSequence
target = np.array([20])

# Reshape training data for Keras LSTM model
data = data.reshape(1, 10, 11)
target = target.reshape(1, 1, 1)

# Build Model
model = Sequential()
model.add(LSTM(11, input_shape=(10, 11), unroll=True, return_sequences=False))
model.add(Dense(11))
model.add(Activation('linear'))
model.compile(loss='mean_squared_error', optimizer='adam')
model.fit(data, target, nb_epoch=1, batch_size=1, verbose=2)

并获取错误ValueError：检查目标时出错：预期activation_1具有2个维度，但得到的形状为数组（1,1,1）不确定激活层应该得到什么（形状明智）任何帮助赞赏感谢

Answer 1

如果你只想拥有一个线性输出神经元，你可以简单地使用一个隐藏单元的密集层并在那里提供激活。然后你的输出可以是一个没有重塑的矢量 - 我调整了给定的示例代码以使其工作：

wholeSequence = np.array(wholeSequence, dtype=float) # Convert to NP array.
data = wholeSequence
target = np.array([20])

# Reshape training data for Keras LSTM model
data = data.reshape(1, 10, 11)

# Build Model
model = Sequential()
model.add(LSTM(11, input_shape=(10, 11), unroll=True, return_sequences=False))
model.add(Dense(1, activation='linear'))
model.compile(loss='mean_squared_error', optimizer='adam')
model.fit(data, target, nb_epoch=1, batch_size=1, verbose=2)

Python Keras LSTM输入输出形状问题

1 个答案: