Retains specified non-empty values within a SparseTensor.
tf.sparse.retain(
    sp_input, to_retain
)
For example, if sp_input has shape [4, 5] and 4 non-empty string values:
[0, 1]: a
[0, 3]: b
[2, 0]: c
[3, 1]: d
and to_retain = [True, False, False, True], then the output will
be a SparseTensor of shape [4, 5] with 2 non-empty values:
[0, 1]: a
[3, 1]: d
| Args | 
|---|
| sp_input | The input SparseTensorwithNnon-empty elements. | 
| to_retain | A bool vector of length NwithMtrue values. | 
| Returns | 
|---|
| A SparseTensorwith the same shape as the input andMnon-empty
elements corresponding to the true positions into_retain. | 
| Raises | 
|---|
| TypeError | If sp_inputis not aSparseTensor. |