我是keras的新用户,并尝试实现LSTM模型 . 对于测试,我声明了如下所示的模型,但由于输入维度的不同而失败 . 虽然我在这个网站上发现了类似的问题,但我自己找不到自己的错误 .
ValueError:
Error when checking model input:
expected lstm_input_4 to have 3 dimensions, but got array with shape (300, 100)
我的环境
-
python 3.5.2
-
keras 1.2.0(Theano)
代码
来自keras.layers导入输入,密集
来自keras.models导入顺序
来自keras.layers导入LSTM
来自keras.optimizers导入RMSprop,Adadelta
来自keras.layers.wrappers导入TimeDistributed
导入numpy为np
in_size = 100
out_size = 10
nb_hidden = 8
model = Sequential()
model.add(LSTM(nb_hidden,
名称= LSTM',
活化= '的tanh',
return_sequences =真,
input_shape =(None,in_size)))
model.add(TimeDistributed(Dense(out_size,activation ='softmax')))
adadelta = Adadelta(clipnorm = 1 . )
model.compile(优化= adadelta,
损失= 'categorical_crossentropy',
度量= [ '准确性'])
#create dummy data
data_size = 300
train = np.zeros((data_size,in_size,),dtype = np.float32)
labels = np.zeros((data_size,out_size,),dtype = np.float32)
model.fit(火车,标签)
编辑1(在MarcinMożejko的评论之后不起作用)
谢谢MarcinMożejko . 但我有类似的错误,如下所示 . 我更新了虚拟数据以供检查 . 这段代码有什么问题?
ValueError:检查模型目标时出错:预期timedistributed_36有3个维度,但得到的数组有形状(208,1)
def create_dataset(X, Y, loop_back=1):
dataX, dataY = [], []
for i in range(len(X) - loop_back-1):
a = X[i:(i+loop_back), :]
dataX.append(a)
dataY.append(Y[i+loop_back, :])
return np.array(dataX), np.array(dataY)
data_size = 300
dataset = np.zeros((data_size, feature_size), dtype=np.float32)
dataset_labels = np.zeros((data_size, 1), dtype=np.float32)
train_size = int(data_size * 0.7)
trainX = dataset[0:train_size, :]
trainY = dataset_labels[0:train_size, :]
testX = dataset[train_size:, :]
testY = dataset_labels[train_size:, 0]
trainX, trainY = create_dataset(trainX, trainY)
print(trainX.shape, trainY.shape) # (208, 1, 1) (208, 1)
# in_size = 100
feature_size = 1
out_size = 1
nb_hidden = 8
model = Sequential()
model.add(LSTM(nb_hidden,
name='lstm',
activation='tanh',
return_sequences=True,
input_shape=(1, feature_size)))
model.add(TimeDistributed(Dense(out_size, activation='softmax')))
adadelta = Adadelta(clipnorm=1.)
model.compile(optimizer=adadelta,
loss='categorical_crossentropy',
metrics=['accuracy'])
model.fit(trainX, trainY, nb_epoch=10, batch_size=1)
1 回答
这是
LSTM
中LSTM
的一个非常经典的问题 .LSTM
输入形状应为2d
- 形状为(sequence_length, nb_of_features)
. 额外的第三个维度来自示例维度 - 因此提供给模型的表格具有形状(nb_of_examples, sequence_length, nb_of_features)
. 这是您的问题所在 . 请记住,1-d
序列应显示为2-d
数组,形状为(sequence_length, 1)
. 这应该是LSTM
的输入形状:并记住以适当的格式输入
reshape
.