Repeats a dataset count times.
dataset_repeat(dataset, count = NULL)A dataset
A dataset
(Optional.) An integer value representing the number of times
the elements of this dataset should be repeated. The default behavior (if
count is NULL or -1) is for the elements to be repeated indefinitely.
Other dataset methods: 
dataset_batch(),
dataset_cache(),
dataset_collect(),
dataset_concatenate(),
dataset_decode_delim(),
dataset_filter(),
dataset_interleave(),
dataset_map(),
dataset_map_and_batch(),
dataset_padded_batch(),
dataset_prefetch(),
dataset_prefetch_to_device(),
dataset_rebatch(),
dataset_reduce(),
dataset_shuffle(),
dataset_shuffle_and_repeat(),
dataset_skip(),
dataset_take(),
dataset_take_while(),
dataset_window()