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Helper to select operations and tensors.

*args list of 1) regular expressions (compiled or not) or 2) (array of) tf.Operation 3) (array of) tf.Tensor. Regular expressions matching tensors must start with the comment "(?#ts)", for instance: "(?#ts)^foo/.*".
**kwargs 'graph': tf.Graph in which to perform the regex query.This is required when using regex. 'positive_filter': an elem if selected only if positive_filter(elem) is True. This is optional.

A tuple (ops, ts) where: ops is a list of tf.Operation, and ts is a list of tf.Tensor

TypeError if the optional keyword argument graph is not a tf.Graph or if an argument in args is not an (array of) tf.Tensor or an (array of) tf.Operation or a string or a regular expression.
ValueError if one of the keyword arguments is unexpected or if a regular expression is used without passing a graph as a keyword argument.