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# tf.data.experimental.sample_from_datasets

Samples elements at random from the datasets in `datasets`. (deprecated)

### Used in the notebooks

Used in the guide Used in the tutorials

Creates a dataset by interleaving elements of `datasets` with `weight[i]` probability of picking an element from dataset `i`. Sampling is done without replacement. For example, suppose we have 2 datasets:

``````dataset1 = tf.data.Dataset.range(0, 3)
dataset2 = tf.data.Dataset.range(100, 103)
``````

Suppose also that we sample from these 2 datasets with the following weights:

``````sample_dataset = tf.data.Dataset.sample_from_datasets(
[dataset1, dataset2], weights=[0.5, 0.5])
``````

One possible outcome of elements in sample_dataset is:

``````print(list(sample_dataset.as_numpy_iterator()))
# [100, 0, 1, 101, 2, 102]
``````

`datasets` A non-empty list of `tf.data.Dataset` objects with compatible structure.
`weights` (Optional.) A list or Tensor of `len(datasets)` floating-point values where `weights[i]` represents the probability to sample from `datasets[i]`, or a `tf.data.Dataset` object where each element is such a list. Defaults to a uniform distribution across `datasets`.
`seed` (Optional.) A `tf.int64` scalar `tf.Tensor`, representing the random seed that will be used to create the distribution. See `tf.random.set_seed` for behavior.
`stop_on_empty_dataset` If `True`, sampling stops if it encounters an empty dataset. If `False`, it skips empty datasets. It is recommended to set it to `True`. Otherwise, the distribution of samples starts off as the user intends, but may change as input datasets become empty. This can be difficult to detect since the dataset starts off looking correct. Default to `False` for backward compatibility.

A dataset that interleaves elements from `datasets` at random, according to `weights` if provided, otherwise with uniform probability.

`TypeError` If the `datasets` or `weights` arguments have the wrong type.
`ValueError`

• If `datasets` is empty, or
• If `weights` is specified and does not match the length of `datasets`.
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