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| # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | |
| import torch | |
| import itertools | |
| from .lr_scheduler import WarmupMultiStepLR, WarmupCosineAnnealingLR, WarmupReduceLROnPlateau | |
| def make_optimizer(cfg, model): | |
| def maybe_add_full_model_gradient_clipping(optim): # optim: the optimizer class | |
| # detectron2 doesn't have full model gradient clipping now | |
| clip_norm_val = cfg.SOLVER.CLIP_GRADIENTS.CLIP_VALUE | |
| enable = ( | |
| cfg.SOLVER.CLIP_GRADIENTS.ENABLED | |
| and cfg.SOLVER.CLIP_GRADIENTS.CLIP_TYPE == "full_model" | |
| and clip_norm_val > 0.0 | |
| ) | |
| class FullModelGradientClippingOptimizer(optim): | |
| def step(self, closure=None): | |
| all_params = itertools.chain(*[x["params"] for x in self.param_groups]) | |
| torch.nn.utils.clip_grad_norm_(all_params, clip_norm_val) | |
| super().step(closure=closure) | |
| return FullModelGradientClippingOptimizer if enable else optim | |
| params = [] | |
| for key, value in model.named_parameters(): | |
| if not value.requires_grad: | |
| continue | |
| lr = cfg.SOLVER.BASE_LR | |
| weight_decay = cfg.SOLVER.WEIGHT_DECAY | |
| # different lr schedule | |
| if "language_backbone" in key: | |
| lr = cfg.SOLVER.LANG_LR | |
| if "backbone.body" in key and "language_backbone.body" not in key: | |
| lr = cfg.SOLVER.BASE_LR * cfg.SOLVER.BACKBONE_BODY_LR_FACTOR | |
| if "bias" in key: | |
| lr *= cfg.SOLVER.BIAS_LR_FACTOR | |
| weight_decay = cfg.SOLVER.WEIGHT_DECAY_BIAS | |
| if 'norm' in key or 'Norm' in key: | |
| weight_decay *= cfg.SOLVER.WEIGHT_DECAY_NORM_FACTOR | |
| print("Setting weight decay of {} to {}".format(key, weight_decay)) | |
| params += [{"params": [value], "lr": lr, "weight_decay": weight_decay}] | |
| if cfg.SOLVER.OPTIMIZER == "SGD": | |
| optimizer = maybe_add_full_model_gradient_clipping(torch.optim.SGD)(params, lr, momentum=cfg.SOLVER.MOMENTUM) | |
| elif cfg.SOLVER.OPTIMIZER == "ADAMW": | |
| optimizer = maybe_add_full_model_gradient_clipping(torch.optim.AdamW)(params, lr) | |
| return optimizer | |
| def make_lr_scheduler(cfg, optimizer): | |
| if cfg.SOLVER.MULTI_MAX_EPOCH: | |
| assert len(cfg.SOLVER.MULTI_MAX_EPOCH) == len(cfg.SOLVER.STEPS) | |
| lr_scheduler = [] | |
| for stage_step, stage_max_epoch in zip(cfg.SOLVER.STEPS, cfg.SOLVER.MULTI_MAX_ITER): | |
| milestones = [] | |
| for step in stage_step: | |
| milestones.append(round(step * stage_max_epoch)) | |
| lr_scheduler.append(WarmupMultiStepLR(optimizer, | |
| milestones, | |
| cfg.SOLVER.GAMMA, | |
| warmup_factor=cfg.SOLVER.WARMUP_FACTOR, | |
| warmup_iters=cfg.SOLVER.WARMUP_ITERS, | |
| warmup_method=cfg.SOLVER.WARMUP_METHOD, ) | |
| ) | |
| return lr_scheduler | |
| elif cfg.SOLVER.USE_COSINE: | |
| max_iters = cfg.SOLVER.MAX_ITER | |
| return WarmupCosineAnnealingLR( | |
| optimizer, | |
| max_iters, | |
| cfg.SOLVER.GAMMA, | |
| warmup_factor=cfg.SOLVER.WARMUP_FACTOR, | |
| warmup_iters=cfg.SOLVER.WARMUP_ITERS, | |
| warmup_method=cfg.SOLVER.WARMUP_METHOD, | |
| eta_min=cfg.SOLVER.MIN_LR | |
| ) | |
| elif cfg.SOLVER.USE_AUTOSTEP: | |
| max_iters = cfg.SOLVER.MAX_ITER | |
| return WarmupReduceLROnPlateau( | |
| optimizer, | |
| max_iters, | |
| cfg.SOLVER.GAMMA, | |
| warmup_factor=cfg.SOLVER.WARMUP_FACTOR, | |
| warmup_iters=cfg.SOLVER.WARMUP_ITERS, | |
| warmup_method=cfg.SOLVER.WARMUP_METHOD, | |
| eta_min=cfg.SOLVER.MIN_LR, | |
| patience=cfg.SOLVER.STEP_PATIENCE, | |
| verbose=True | |
| ) | |
| else: | |
| milestones = [] | |
| for step in cfg.SOLVER.STEPS: | |
| if step < 1: | |
| milestones.append(round(step * cfg.SOLVER.MAX_ITER)) | |
| else: | |
| milestones.append(step) | |
| return WarmupMultiStepLR( | |
| optimizer, | |
| milestones, | |
| cfg.SOLVER.GAMMA, | |
| warmup_factor=cfg.SOLVER.WARMUP_FACTOR, | |
| warmup_iters=cfg.SOLVER.WARMUP_ITERS, | |
| warmup_method=cfg.SOLVER.WARMUP_METHOD, | |
| ) | |