Joins all strings into a single string, or joins along an axis.
tf.compat.v1.reduce_join(
    inputs,
    axis=None,
    keep_dims=None,
    separator='',
    name=None,
    reduction_indices=None,
    keepdims=None
)
This is the reduction operation for the elementwise tf.strings.join op.
tf.strings.reduce_join([['abc','123'],
                        ['def','456']]).numpy()
b'abc123def456'
tf.strings.reduce_join([['abc','123'],
                        ['def','456']], axis=-1).numpy()
array([b'abc123', b'def456'], dtype=object)
tf.strings.reduce_join([['abc','123'],
                        ['def','456']],
                       axis=-1,
                       separator=" ").numpy()
array([b'abc 123', b'def 456'], dtype=object)
| Args | 
|---|
| inputs | A tf.stringtensor. | 
| axis | Which axis to join along. The default behavior is to join all
elements, producing a scalar. | 
| keepdims | If true, retains reduced dimensions with length 1. | 
| separator | a string added between each string being joined. | 
| name | A name for the operation (optional). |