我正在使用keras R构建一个分类模型,我的代码如下:
model <- keras_model_sequential()
model %>%
layer_dense(units = 256, activation = 'relu', input_shape = ncol(x_train),kernel_regularizer = regularizer_l2(0.001),) %>%
layer_dropout(rate = 0.4) %>%
layer_dense(units = 128, activation = 'relu',kernel_regularizer = regularizer_l2(0.001),) %>%
layer_dropout(rate = 0.3) %>%
layer_dense(units = 2, activation = 'sigmoid')
history <- model %>% compile(
loss = 'binary_crossentropy',
optimizer = 'adam',
metrics = c('accuracy')
)
model %>% fit(x_train,
y_train,
epochs = 50,
batch_size = 128,
validation_data = (x_val,y_val))
一切都很好,但是当我尝试使用"validation_data"传递外部数据(x_val、y_val(以用作验证数据时,它得到了此错误:
Error: unexpected ',' in:
" batch_size = 128,
validation_data =(x_val,"
如果我简单地使用 validation_split=0.2,那么一切都很好。我看了很多次代码,但无法弄清楚这里出了什么问题。有人可以帮我吗?
非常感谢,河
该问题基于要传递的输入参数。 这应该是一个list
,因为R
中没有tuple
(尽管它在python
根据 keras 文档
validation_data - 在每个纪元结束时评估损失和任何模型指标的数据。不会在此数据上训练模型。这可以是列表(x_val、y_val(或列表(x_val、y_val、val_sample_weights(。validation_data将覆盖validation_split。
因此,我们只需将(x_val, y_val)
替换为list(x_val, y_val)
model %>%
fit(x_train,
y_train,
epochs = 50,
batch_size = 128,
validation_data = list(x_val,y_val))