A few optimizer comments, dead import, missing import

Author: rwightman

timm/optim/__init__.py

@@ -3,6 +3,7 @@
 from .adafactor import Adafactor
 from .adahessian import Adahessian
 from .lookahead import Lookahead
+from .madgrad import MADGRAD
 from .nadam import Nadam
 from .nvnovograd import NvNovoGrad
 from .radam import RAdam

timm/optim/madgrad.py

@@ -1,3 +1,9 @@
+""" PyTorch MADGRAD optimizer
+
+MADGRAD: https://arxiv.org/abs/2101.11075
+
+Code from: https://github.com/facebookresearch/madgrad
+"""
 # Copyright (c) Facebook, Inc. and its affiliates.
 #
 # This source code is licensed under the MIT license found in the

timm/optim/optim_factory.py

@@ -1,12 +1,11 @@
 """ Optimizer Factory w/ Custom Weight Decay
-Hacked together by / Copyright 2020 Ross Wightman
+Hacked together by / Copyright 2021 Ross Wightman
 """
 from typing import Optional
 
 import torch
 import torch.nn as nn
 import torch.optim as optim
-from torch.optim.optimizer import required
 
 from .adabelief import AdaBelief
 from .adafactor import Adafactor