我对TensorFlow和LSTM架构还比较新。我在解决如何为我的数据集确定输入和输出(x_train、x_test、y_train、y_test)方面遇到了问题。
我的原始输入形状如下:
- x_train:(366,4)
- x_test:(104,4)
- y_train:(366,)
- y_test:(104,)
y_train和y_test是一系列股票价格。x_train和x_test是我要用来预测股票价格的四个特征。
# Splitting the training and testing data
train_start_date = '2010-01-08'
train_end_date = '2017-01-06'
test_start_date = '2017-01-13'
test_end_date = '2019-01-04'
train = df.ix[train_start_date : train_end_date]
test = df.ix[test_start_date:test_end_date]
X_test = sentimentScorer(test)
X_train = sentimentScorer(train)
Y_test = test['prices']
Y_train = train['prices']
#Conversion in 3D array for LSTM INPUT
X_test = X_test.reshape(1, 104, 4)
X_train = X_train.reshape(1, 366, 4)
model = Sequential()
model.add(LSTM(128, input_shape=(366,4), activation='relu',
return_sequences=True))
model.add(Dropout(0.2))
model.add(LSTM(128, activation='relu'))
model.add(Dropout(0.1))
model.add(Dense(32, activation='relu'))
model.add(Dropout(0.2))
model.add(Dense(10, activation='softmax'))
opt = tf.keras.optimizers.Adam(lr=0.001, decay=1e-6)
# Compile model
model.compile(
loss='sparse_categorical_crossentropy',
optimizer=opt,
metrics=['accuracy'],
)
model.fit(X_train,
Y_train,
epochs=3,
validation_data=(X_test, Y_test))
这是生成的错误:
> --------------------------------------------------------------------------- ValueError Traceback (most recent call
> last) <ipython-input-101-fd4099583529> in <module>
> 65 Y_train,
> 66 epochs=3,
> ---> 67 validation_data=(X_test, Y_test))
>
> c:\users\talal\appdata\local\programs\python\python36\lib\site-packages\tensorflow\python\keras\engine\training.py
> in fit(self, x, y, batch_size, epochs, verbose, callbacks,
> validation_split, validation_data, shuffle, class_weight,
> sample_weight, initial_epoch, steps_per_epoch, validation_steps,
> **kwargs) 1507 steps_name='steps_per_epoch', 1508 steps=steps_per_epoch,
> -> 1509 validation_split=validation_split) 1510 1511 # Prepare validation data.
>
> c:\users\talal\appdata\local\programs\python\python36\lib\site-packages\tensorflow\python\keras\engine\training.py
> in _standardize_user_data(self, x, y, sample_weight, class_weight,
> batch_size, check_steps, steps_name, steps, validation_split)
> 991 x, y = next_element
> 992 x, y, sample_weights = self._standardize_weights(x, y, sample_weight,
> --> 993 class_weight, batch_size)
> 994 return x, y, sample_weights
> 995
>
> c:\users\talal\appdata\local\programs\python\python36\lib\site-packages\tensorflow\python\keras\engine\training.py
> in _standardize_weights(self, x, y, sample_weight, class_weight,
> batch_size) 1110 feed_input_shapes, 1111
> check_batch_axis=False, # Don't enforce the batch size.
> -> 1112 exception_prefix='input') 1113 1114 if y is not None:
>
> c:\users\talal\appdata\local\programs\python\python36\lib\site-packages\tensorflow\python\keras\engine\training_utils.py
> in standardize_input_data(data, names, shapes, check_batch_axis,
> exception_prefix)
> 314 ': expected ' + names[i] + ' to have ' +
> 315 str(len(shape)) + ' dimensions, but got array '
> --> 316 'with shape ' + str(data_shape))
> 317 if not check_batch_axis:
> 318 data_shape = data_shape[1:]
>
> ValueError: Error when checking input: expected lstm_18_input to have
> 3 dimensions, but got array with shape (366, 4)