class_docstr: Base class for internal decays for PowerSign and AddSign optimizers.
  
  Arguments:
      T_max (int): the total number of training steps
          to be used to compute internal decays.
code: def __init__(self, T_max):
      if T_max < 1:
          raise ValueError("T_max should be >= 1.")
  
      self.T_max = T_max
  
file_path: pywick/pywick/optimizers/sign_internal_decay.py
imports: import math
label_desc: Use image node_id 1 to create a new _SignInternalDecay object  with example: obj = _SignInternalDecay(T_max)