A bucketized representation of likelihood, which is intended
to give clients highly stable results across model upgrades.
Values:
UNKNOWN (0):
Unknown likelihood.
VERY_UNLIKELY (1):
It is very unlikely that the image belongs to
the specified vertical.
UNLIKELY (2):
It is unlikely that the image belongs to the
specified vertical.
POSSIBLE (3):
It is possible that the image belongs to the
specified vertical.
LIKELY (4):
It is likely that the image belongs to the
specified vertical.
VERY_LIKELY (5):
It is very likely that the image belongs to
the specified vertical.