The type of scaling that should be applied to this parameter.
Values:
SCALE_TYPE_UNSPECIFIED (0):
By default, no scaling is applied.
UNIT_LINEAR_SCALE (1):
Scales the feasible space to (0, 1) linearly.
UNIT_LOG_SCALE (2):
Scales the feasible space logarithmically to
(0, 1). The entire feasible space must be
strictly positive.
UNIT_REVERSE_LOG_SCALE (3):
Scales the feasible space "reverse"
logarithmically to (0, 1). The result is that
values close to the top of the feasible space
are spread out more than points near the bottom.
The entire feasible space must be strictly
positive.