[Vision] add a new function 'detect_all' in image.py #3771
Description
There is a function detect in image.py for detecting multiple feature types. Could we add a function called detect_all to detect all feature types at one time? This is my proposal:
def detect_all(self, limit=10):
"""Detect multiple feature types.
:type limit: int
:param limit: The number of faces to try and detect.
:rtype: list
:returns: List of
:class:`~google.cloud.vision.entity.EntityAnnotation`.
"""
features = [Feature(x, limit) for x in FeatureTypes.__dict__.keys() if x[:1] != '_']
annotations = self.detect(features)
return annotations[0]