254 lines
10 KiB
Python
254 lines
10 KiB
Python
import logging
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import os
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import torch
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from apex import amp
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from torch.nn.parallel import DataParallel, DistributedDataParallel
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import torch.nn as nn
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import models.lr_scheduler as lr_scheduler
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import models.networks as networks
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from models.base_model import BaseModel
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from models.steps.steps import ConfigurableStep
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import torchvision.utils as utils
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logger = logging.getLogger('base')
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class ExtensibleTrainer(BaseModel):
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def __init__(self, opt):
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super(ExtensibleTrainer, self).__init__(opt)
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if opt['dist']:
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self.rank = torch.distributed.get_rank()
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else:
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self.rank = -1 # non dist training
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train_opt = opt['train']
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# env is used as a global state to store things that subcomponents might need.
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self.env = {'device': self.device,
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'rank': self.rank,
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'opt': opt,
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'step': 0}
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self.netsG = {}
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self.netsD = {}
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self.netF = networks.define_F().to(self.device) # Used to compute feature loss.
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for name, net in opt['networks'].items():
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if net['type'] == 'generator':
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new_net = networks.define_G(net, None, opt['scale']).to(self.device)
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self.netsG[name] = new_net
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elif net['type'] == 'discriminator':
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new_net = networks.define_D_net(net, opt['datasets']['train']['target_size']).to(self.device)
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self.netsD[name] = new_net
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else:
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raise NotImplementedError("Can only handle generators and discriminators")
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# Initialize the train/eval steps
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self.steps = []
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for step_name, step in opt['steps'].items():
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step = ConfigurableStep(step, self.env)
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self.steps.append(step)
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if self.is_train:
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self.mega_batch_factor = train_opt['mega_batch_factor']
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if self.mega_batch_factor is None:
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self.mega_batch_factor = 1
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self.env['mega_batch_factor'] = self.mega_batch_factor
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# The steps rely on the networks being placed in the env, so put them there. Even though they arent wrapped
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# yet.
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self.env['generators'] = self.netsG
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self.env['discriminators'] = self.netsD
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# Define the optimizers from the steps
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for s in self.steps:
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s.define_optimizers()
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self.optimizers.extend(s.get_optimizers())
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# Find the optimizers that are using the default scheduler, then build them.
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def_opt = []
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for s in self.steps:
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def_opt.extend(s.get_optimizers_with_default_scheduler())
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self.schedulers = lr_scheduler.get_scheduler_for_name(train_opt['default_lr_scheme'], def_opt, train_opt)
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# Initialize amp.
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total_nets = [g for g in self.netsG.values()] + [d for d in self.netsD.values()]
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amp_nets, amp_opts = amp.initialize(total_nets + [self.netF] + self.steps,
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self.optimizers, opt_level=opt['amp_opt_level'], num_losses=len(opt['steps']))
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# Unwrap steps & netF
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self.netF = amp_nets[len(total_nets)]
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assert(len(self.steps) == len(amp_nets[len(total_nets)+1:]))
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self.steps = amp_nets[len(total_nets)+1:]
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amp_nets = amp_nets[:len(total_nets)]
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# DataParallel
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dnets = []
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for anet in amp_nets:
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if opt['dist']:
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dnet = DistributedDataParallel(anet,
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device_ids=[torch.cuda.current_device()],
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find_unused_parameters=True)
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else:
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dnet = DataParallel(anet)
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if self.is_train:
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dnet.train()
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else:
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dnet.eval()
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dnets.append(dnet)
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if not opt['dist']:
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self.netF = DataParallel(self.netF)
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# Backpush the wrapped networks into the network dicts..
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self.networks = {}
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found = 0
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for dnet in dnets:
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for net_dict in [self.netsD, self.netsG]:
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for k, v in net_dict.items():
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if v == dnet.module:
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net_dict[k] = dnet
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self.networks[k] = dnet
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found += 1
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assert found == len(self.netsG) + len(self.netsD)
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# Replace the env networks with the wrapped networks
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self.env['generators'] = self.netsG
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self.env['discriminators'] = self.netsD
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self.print_network() # print network
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self.load() # load G and D if needed
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# Setting this to false triggers SRGAN to call the models update_model() function on the first iteration.
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self.updated = True
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def feed_data(self, data):
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self.lq = torch.chunk(data['LQ'].to(self.device), chunks=self.mega_batch_factor, dim=0)
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self.hq = [t.to(self.device) for t in torch.chunk(data['GT'], chunks=self.mega_batch_factor, dim=0)]
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input_ref = data['ref'] if 'ref' in data else data['GT']
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self.ref = [t.to(self.device) for t in torch.chunk(input_ref, chunks=self.mega_batch_factor, dim=0)]
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self.dstate = {'lq': self.lq, 'hq': self.hq, 'ref': self.ref}
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for k, v in data.items():
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if k not in ['LQ', 'ref', 'GT'] and isinstance(v, torch.Tensor):
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self.dstate[k] = [t.to(self.device) for t in torch.chunk(v, chunks=self.mega_batch_factor, dim=0)]
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def optimize_parameters(self, step):
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self.env['step'] = step
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# Some models need to make parametric adjustments per-step. Do that here.
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for net in self.networks.values():
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if hasattr(net.module, "update_for_step"):
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net.module.update_for_step(step, os.path.join(self.opt['path']['models'], ".."))
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# Iterate through the steps, performing them one at a time.
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state = self.dstate
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for step_num, s in enumerate(self.steps):
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# Only set requires_grad=True for the network being trained.
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nets_to_train = s.get_networks_trained()
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enabled = 0
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for name, net in self.networks.items():
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net_enabled = name in nets_to_train
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if net_enabled:
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enabled += 1
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for p in net.parameters():
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if p.dtype != torch.int64 and p.dtype != torch.bool:
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p.requires_grad = net_enabled
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else:
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p.requires_grad = False
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assert enabled == len(nets_to_train)
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for o in s.get_optimizers():
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o.zero_grad()
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# Now do a forward and backward pass for each gradient accumulation step.
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new_states = {}
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for m in range(self.mega_batch_factor):
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ns = s.do_forward_backward(state, m, step_num)
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for k, v in ns.items():
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if k not in new_states.keys():
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new_states[k] = [v]
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else:
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new_states[k].append(v)
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# Push the detached new state tensors into the state map for use with the next step.
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for k, v in new_states.items():
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# State is immutable to reduce complexity. Overwriting existing state keys is not supported.
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assert k not in state.keys()
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state[k] = v
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# And finally perform optimization.
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s.do_step()
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# Record visual outputs for usage in debugging and testing.
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if 'visuals' in self.opt['logger'].keys():
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sample_save_path = os.path.join(self.opt['path']['models'], "..", "visual_dbg")
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for v in self.opt['logger']['visuals']:
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if step % self.opt['logger']['visual_debug_rate'] == 0:
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for i, dbgv in enumerate(state[v]):
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os.makedirs(os.path.join(sample_save_path, v), exist_ok=True)
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utils.save_image(dbgv, os.path.join(sample_save_path, v, "%05i_%02i.png" % (step, i)))
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def compute_fea_loss(self, real, fake):
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with torch.no_grad():
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logits_real = self.netF(real)
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logits_fake = self.netF(fake)
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return nn.L1Loss().to(self.device)(logits_fake, logits_real)
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def test(self):
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for net in self.netsG.values():
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net.eval()
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with torch.no_grad():
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# Iterate through the steps, performing them one at a time.
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state = self.dstate
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for step_num, s in enumerate(self.steps):
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ns = s.do_forward_backward(state, 0, step_num, backward=False)
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for k, v in ns.items():
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state[k] = [v]
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self.eval_state = state
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for net in self.netsG.values():
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net.train()
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# Fetches a summary of the log.
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def get_current_log(self, step):
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log = {}
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for s in self.steps:
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log.update(s.get_metrics())
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# Some generators can do their own metric logging.
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for net in self.networks.values():
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if hasattr(net.module, "get_debug_values"):
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log.update(net.module.get_debug_values(step))
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return log
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def get_current_visuals(self, need_GT=True):
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# Conforms to an archaic format from MMSR.
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return {'LQ': self.eval_state['lq'][0].float().cpu(),
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'GT': self.eval_state['hq'][0].float().cpu(),
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'rlt': self.eval_state[self.opt['eval']['output_state']][0].float().cpu()}
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def print_network(self):
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for name, net in self.networks.items():
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s, n = self.get_network_description(net)
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net_struc_str = '{}'.format(net.__class__.__name__)
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if self.rank <= 0:
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logger.info('Network {} structure: {}, with parameters: {:,d}'.format(name, net_struc_str, n))
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logger.info(s)
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def load(self):
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for netdict in [self.netsG, self.netsD]:
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for name, net in netdict.items():
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load_path = self.opt['path']['pretrain_model_%s' % (name,)]
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if load_path is not None:
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logger.info('Loading model for [%s]' % (load_path))
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self.load_network(load_path, net)
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def save(self, iter_step):
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for name, net in self.networks.items():
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self.save_network(net, name, iter_step)
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def force_restore_swapout(self):
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# Legacy method. Do nothing.
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pass |