Combine two Tensorflow Datasets-CodePudding

I have two Tensorflow datasets which I process separately to get different windows for features and target:

window_size_x = 3
window_size_y = 2
shift_size = 1

x = np.arange(10)
y = x * 10

x = x[:-window_size_y]
y = y[window_size_x:]

ds_x = tf.data.Dataset.from_tensor_slices(x).window(window_size_x, shift=shift_size, drop_remainder=True)
ds_y = tf.data.Dataset.from_tensor_slices(y).window(window_size_y, shift=shift_size, drop_remainder=True)

for i, j in zip(ds_x, ds_y):
  print(list(i.as_numpy_iterator()), list(j.as_numpy_iterator()))

Output:

[0, 1, 2] [30, 40]
[1, 2, 3] [40, 50]
[2, 3, 4] [50, 60]
[3, 4, 5] [60, 70]
[4, 5, 6] [70, 80]
[5, 6, 7] [80, 90]

When I finally feed these two datasets into the model using model.fit(ds_x, ds_y) I get the following error:

ValueError: `y` argument is not supported when using dataset as input.

When I try to combine both datasets like in this answer, I get another error:

ds_all = tf.data.Dataset.from_tensor_slices((ds_x, ds_y))

Error:

ValueError: Slicing dataset elements is not supported for rank 0.

What is the proper way to combine two datasets?

CodePudding user response：

Use tf.data.Dataset.zip to combine features and labels.

ds_all = tf.data.Dataset.from_tensor_slices(*tf.data.Dataset.zip(
                                               (ds_x.batch(BATCH_SIZE),
                                                ds_y.batch(BATCH_SIZE))
                                            ))