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Helper to select operations.

*args list of 1) regular expressions (compiled or not) or 2) (array of) tf.Operation. tf.Tensor instances are silently ignored.
**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. 'restrict_ops_regex': a regular expression is ignored if it doesn't start with the substring "(?#ops)".

A list of tf.Operation.

TypeError if the optional keyword argument graph is not a tf.Graph or if an argument in args is not an (array of) tf.Operation or an (array of) tf.Tensor (silently ignored) 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.