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62 lines
2.7 KiB
62 lines
2.7 KiB
2 years ago
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# Copyright (c) ByteDance, Inc. and its affiliates.
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# All rights reserved.
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#
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# This source code is licensed under the license found in the
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# LICENSE file in the root directory of this source tree.
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import math
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from pprint import pformat
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def lr_wd_annealing(optimizer, peak_lr, wd, cur_it, wp_it, max_it):
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wp_it = round(wp_it)
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if cur_it < wp_it:
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cur_lr = 0.005 * peak_lr + 0.995 * peak_lr * cur_it / wp_it
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else:
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ratio = (cur_it - wp_it) / (max_it - 1 - wp_it)
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cur_lr = 0.001 * peak_lr + 0.999 * peak_lr * (0.5 + 0.5 * math.cos(math.pi * ratio))
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min_lr, max_lr = cur_lr, cur_lr
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min_wd, max_wd = wd, wd
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for param_group in optimizer.param_groups:
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scaled_lr = param_group['lr'] = cur_lr * param_group.get('lr_scale', 1) # 'lr_scale' could be assigned
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min_lr, max_lr = min(min_lr, scaled_lr), max(max_lr, scaled_lr)
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scaled_wd = param_group['weight_decay'] = wd * param_group.get('weight_decay_scale', 1) # 'weight_decay_scale' could be assigned
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min_wd, max_wd = min(min_wd, scaled_wd), max(max_wd, scaled_wd)
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return min_lr, max_lr, min_wd, max_wd
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def get_param_groups(model, nowd_keys=(), lr_scale=0.0):
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using_lr_scale = hasattr(model, 'get_layer_id_and_scale_exp') and 0.0 < lr_scale < 1.0
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print(f'[get_ft_param_groups][lr decay] using_lr_scale={using_lr_scale}, ft_lr_scale={lr_scale}')
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para_groups, para_groups_dbg = {}, {}
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for name, para in model.named_parameters():
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if not para.requires_grad:
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continue # frozen weights
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if len(para.shape) == 1 or name.endswith('.bias') or any(k in name for k in nowd_keys):
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wd_scale, group_name = 0., 'no_decay'
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else:
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wd_scale, group_name = 1., 'decay'
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if using_lr_scale:
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layer_id, scale_exp = model.get_layer_id_and_scale_exp(name)
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group_name = f'layer{layer_id}_' + group_name
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this_lr_scale = lr_scale ** scale_exp
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dbg = f'[layer {layer_id}][sc = {lr_scale} ** {scale_exp}]'
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else:
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this_lr_scale = 1
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dbg = f'[no scale]'
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if group_name not in para_groups:
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para_groups[group_name] = {'params': [], 'weight_decay_scale': wd_scale, 'lr_scale': this_lr_scale}
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para_groups_dbg[group_name] = {'params': [], 'weight_decay_scale': wd_scale, 'lr_scale': dbg}
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para_groups[group_name]['params'].append(para)
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para_groups_dbg[group_name]['params'].append(name)
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for g in para_groups_dbg.values():
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g['params'] = pformat(', '.join(g['params']), width=200)
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print(f'[get_ft_param_groups] param groups = \n{pformat(para_groups_dbg, indent=2, width=250)}\n')
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return list(para_groups.values())
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