364 lines
18 KiB
Python
364 lines
18 KiB
Python
from torch.cuda.amp import autocast
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from models.steps.losses import ConfigurableLoss, GANLoss, extract_params_from_state, get_basic_criterion_for_name
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from models.flownet2.networks.resample2d_package.resample2d import Resample2d
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from models.steps.injectors import Injector
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import torch
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import torch.nn.functional as F
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import os
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import os.path as osp
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import torchvision
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import torch.distributed as dist
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def create_teco_loss(opt, env):
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type = opt['type']
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if type == 'teco_gan':
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return TecoGanLoss(opt, env)
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elif type == "teco_pingpong":
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return PingPongLoss(opt, env)
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return None
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def create_teco_injector(opt, env):
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type = opt['type']
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if type == 'teco_recurrent_generated_sequence_injector':
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return RecurrentImageGeneratorSequenceInjector(opt, env)
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elif type == 'teco_flow_adjustment':
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return FlowAdjustment(opt, env)
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return None
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def extract_inputs_index(inputs, i):
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res = []
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for input in inputs:
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if isinstance(input, torch.Tensor):
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res.append(input[:, i])
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else:
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res.append(input)
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return res
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# Uses a generator to synthesize a sequence of images from [in] and injects the results into a list [out]
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# Images are fed in sequentially forward and back, resulting in len([out])=2*len([in])-1 (last element is not repeated).
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# All computation is done with torch.no_grad().
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class RecurrentImageGeneratorSequenceInjector(Injector):
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def __init__(self, opt, env):
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super(RecurrentImageGeneratorSequenceInjector, self).__init__(opt, env)
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self.flow = opt['flow_network']
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self.input_lq_index = opt['input_lq_index'] if 'input_lq_index' in opt.keys() else 0
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self.output_hq_index = opt['output_hq_index'] if 'output_hq_index' in opt.keys() else 0
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self.recurrent_index = opt['recurrent_index']
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self.scale = opt['scale']
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self.resample = Resample2d()
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self.first_inputs = opt['first_inputs'] if 'first_inputs' in opt.keys() else opt['in'] # Use this to specify inputs that will be used in the first teco iteration, the rest will use 'in'.
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self.do_backwards = opt['do_backwards'] if 'do_backwards' in opt.keys() else True
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self.hq_recurrent = opt['hq_recurrent'] if 'hq_recurrent' in opt.keys() else False # When True, recurrent_index is not touched for the first iteration, allowing you to specify what is fed in. When False, zeros are fed into the recurrent index.
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def forward(self, state):
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gen = self.env['generators'][self.opt['generator']]
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flow = self.env['generators'][self.flow]
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first_inputs = extract_params_from_state(self.first_inputs, state)
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inputs = extract_params_from_state(self.input, state)
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if not isinstance(inputs, list):
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inputs = [inputs]
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if not isinstance(self.output, list):
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self.output = [self.output]
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results = {}
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for out_key in self.output:
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results[out_key] = []
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# Go forward in the sequence first.
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first_step = True
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b, f, c, h, w = inputs[self.input_lq_index].shape
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debug_index = 0
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for i in range(f):
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if first_step:
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input = extract_inputs_index(first_inputs, i)
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if self.hq_recurrent:
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recurrent_input = input[self.recurrent_index]
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else:
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recurrent_input = torch.zeros_like(input[self.recurrent_index])
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first_step = False
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else:
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input = extract_inputs_index(inputs, i)
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with torch.no_grad() and autocast(enabled=False):
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# This is a hack to workaround the fact that flownet2 cannot operate at resolutions < 64px. An assumption is
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# made here that if you are operating at 4x scale, your inputs are 32px x 32px
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if self.scale >= 4:
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flow_input = F.interpolate(input[self.input_lq_index], scale_factor=self.scale//2, mode='bicubic')
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else:
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flow_input = input[self.input_lq_index]
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reduced_recurrent = F.interpolate(recurrent_input, scale_factor=.5, mode='bicubic')
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flow_input = torch.stack([flow_input, reduced_recurrent], dim=2).float()
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flowfield = F.interpolate(flow(flow_input), scale_factor=2, mode='bicubic')
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recurrent_input = self.resample(recurrent_input.float(), flowfield)
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input[self.recurrent_index] = recurrent_input
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if self.env['step'] % 50 == 0:
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self.produce_teco_visual_debugs(input[self.input_lq_index], input[self.recurrent_index], debug_index)
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debug_index += 1
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with autocast(enabled=self.env['opt']['fp16']):
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gen_out = gen(*input)
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if isinstance(gen_out, torch.Tensor):
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gen_out = [gen_out]
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for i, out_key in enumerate(self.output):
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results[out_key].append(gen_out[i])
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recurrent_input = gen_out[self.output_hq_index]
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# Now go backwards, skipping the last element (it's already stored in recurrent_input)
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if self.do_backwards:
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it = reversed(range(f - 1))
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for i in it:
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input = extract_inputs_index(inputs, i)
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with torch.no_grad():
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with autocast(enabled=False):
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# This is a hack to workaround the fact that flownet2 cannot operate at resolutions < 64px. An assumption is
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# made here that if you are operating at 4x scale, your inputs are 32px x 32px
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if self.scale >= 4:
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flow_input = F.interpolate(input[self.input_lq_index], scale_factor=self.scale//2, mode='bicubic')
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else:
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flow_input = input[self.input_lq_index]
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reduced_recurrent = F.interpolate(recurrent_input, scale_factor=.5, mode='bicubic')
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flow_input = torch.stack([flow_input, reduced_recurrent], dim=2).float()
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flowfield = F.interpolate(flow(flow_input), scale_factor=2, mode='bicubic')
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recurrent_input = self.resample(recurrent_input.float(), flowfield)
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input[self.recurrent_index] = recurrent_input
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if self.env['step'] % 50 == 0:
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self.produce_teco_visual_debugs(input[self.input_lq_index], input[self.recurrent_index], debug_index)
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debug_index += 1
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with autocast(enabled=self.env['opt']['fp16']):
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gen_out = gen(*input)
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if isinstance(gen_out, torch.Tensor):
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gen_out = [gen_out]
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for i, out_key in enumerate(self.output):
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results[out_key].append(gen_out[i])
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recurrent_input = gen_out[self.output_hq_index]
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final_results = {}
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# Include 'hq_batched' here - because why not... Don't really need a separate injector for this.
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b, s, c, h, w = state['hq'].shape
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final_results['hq_batched'] = state['hq'].view(b*s, c, h, w)
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for k, v in results.items():
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final_results[k] = torch.stack(v, dim=1)
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final_results[k + "_batched"] = torch.cat(v[:s], dim=0) # Only include the original sequence - this output is generally used to compare against HQ.
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return final_results
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def produce_teco_visual_debugs(self, gen_input, gen_recurrent, it):
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if self.env['rank'] > 0:
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return
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base_path = osp.join(self.env['base_path'], "..", "visual_dbg", "teco_geninput", str(self.env['step']))
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os.makedirs(base_path, exist_ok=True)
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torchvision.utils.save_image(gen_input.float(), osp.join(base_path, "%s_img.png" % (it,)))
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torchvision.utils.save_image(gen_recurrent.float(), osp.join(base_path, "%s_recurrent.png" % (it,)))
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class FlowAdjustment(Injector):
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def __init__(self, opt, env):
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super(FlowAdjustment, self).__init__(opt, env)
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self.resample = Resample2d()
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self.flow = opt['flow_network']
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self.flow_target = opt['flow_target']
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self.flowed = opt['flowed']
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def forward(self, state):
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with autocast(enabled=False):
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flow = self.env['generators'][self.flow]
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flow_target = state[self.flow_target]
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flowed = F.interpolate(state[self.flowed], size=flow_target.shape[2:], mode='bicubic')
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flow_input = torch.stack([flow_target, flowed], dim=2).float()
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flowfield = F.interpolate(flow(flow_input), size=state[self.flowed].shape[2:], mode='bicubic')
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return {self.output: self.resample(state[self.flowed], flowfield)}
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def create_teco_discriminator_sextuplet(input_list, lr_imgs, scale, index, flow_gen, resampler, margin):
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# Flow is interpreted from the LR images so that the generator cannot learn to manipulate it.
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with autocast(enabled=False):
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triplet = input_list[:, index:index+3].float()
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first_flow = flow_gen(torch.stack([triplet[:,1], triplet[:,0]], dim=2))
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last_flow = flow_gen(torch.stack([triplet[:,1], triplet[:,2]], dim=2))
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flow_triplet = [resampler(triplet[:,0], first_flow),
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triplet[:,1],
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resampler(triplet[:,2], last_flow)]
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flow_triplet = torch.stack(flow_triplet, dim=1)
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combined = torch.cat([triplet, flow_triplet], dim=1)
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b, f, c, h, w = combined.shape
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combined = combined.view(b, 3*6, h, w) # 3*6 is essentially an assertion here.
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# Apply margin
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return combined[:, :, margin:-margin, margin:-margin]
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def create_all_discriminator_sextuplets(input_list, lr_imgs, scale, total, flow_gen, resampler, margin):
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# Combine everything and feed it into the flow network at once for better efficiency.
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batch_sz = input_list.shape[0]
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flux_doubles_forward = [torch.stack([input_list[:,i], input_list[:,i+1]], dim=2) for i in range(1, total+1)]
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flux_doubles_backward = [torch.stack([input_list[:,i], input_list[:,i-1]], dim=2) for i in range(1, total+1)]
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flows_forward = flow_gen(torch.cat(flux_doubles_forward, dim=0))
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flows_backward = flow_gen(torch.cat(flux_doubles_backward, dim=0))
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sexts = []
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for i in range(total):
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flow_forward = flows_forward[batch_sz*i:batch_sz*(i+1)]
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flow_backward = flows_backward[batch_sz*i:batch_sz*(i+1)]
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mid = input_list[:,i+1]
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sext = torch.stack([input_list[:,i], mid, input_list[:,i+2],
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resampler(mid, flow_backward),
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mid,
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resampler(mid, flow_forward)], dim=1)
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# Apply margin
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b, f, c, h, w = sext.shape
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sext = sext.view(b, 3*6, h, w) # f*c = 6*3
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sext = sext[:, :, margin:-margin, margin:-margin]
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sexts.append(sext)
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return torch.cat(sexts, dim=0)
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# This is the temporal discriminator loss from TecoGAN.
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#
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# It has a strict contract for 'real' and 'fake' inputs:
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# 'real' - Must be a list of arbitrary images (len>3) drawn from the dataset
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# 'fake' - The output of the RecurrentImageGeneratorSequenceInjector for the same set of images.
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#
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# This loss does the following:
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# 1) Picks an image triplet, starting with the first '3' elements in 'real' and 'fake'.
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# 2) Uses the image flow generator (specified with 'image_flow_generator') to create detached flow fields for the first and last images in the above sequence.
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# 3) Warps the first and last images according to the flow field.
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# 4) Composes the three base image and the 2 warped images and middle image into a tensor concatenated at the filter dimension for both real and fake, resulting in a bx18xhxw shape tensor.
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# 5) Feeds the catted real and fake image sets into the discriminator, computes a loss, and backward().
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# 6) Repeat from (1) until all triplets from the real sequence have been exhausted.
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class TecoGanLoss(ConfigurableLoss):
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def __init__(self, opt, env):
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super(TecoGanLoss, self).__init__(opt, env)
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self.criterion = GANLoss(opt['gan_type'], 1.0, 0.0).to(env['device'])
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# TecoGAN parameters
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self.scale = opt['scale']
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self.lr_inputs = opt['lr_inputs']
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self.image_flow_generator = opt['image_flow_generator']
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self.resampler = Resample2d()
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self.for_generator = opt['for_generator']
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self.min_loss = opt['min_loss'] if 'min_loss' in opt.keys() else 0
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self.margin = opt['margin'] # Per the tecogan paper, the GAN loss only pays attention to an inner part of the image with the margin removed, to get rid of artifacts resulting from flow errors.
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self.ff = opt['fast_forward'] if 'fast_forward' in opt.keys() else False
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self.noise = opt['noise'] if 'noise' in opt.keys() else 0
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def forward(self, _, state):
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if self.ff:
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return self.fast_forward(state)
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else:
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return self.lowmem_forward(state)
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# Computes the discriminator loss one recursive step at a time, which has a lower memory overhead but is
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# slower.
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def lowmem_forward(self, state):
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flow_gen = self.env['generators'][self.image_flow_generator]
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real = state[self.opt['real']]
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fake = state[self.opt['fake']]
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sequence_len = real.shape[1]
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lr = state[self.opt['lr_inputs']]
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l_total = 0
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# Create a list of all the discriminator inputs, which will be reduced into the batch dim for efficient computation.
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for i in range(sequence_len - 2):
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real_sext = create_teco_discriminator_sextuplet(real, lr, self.scale, i, flow_gen, self.resampler, self.margin)
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fake_sext = create_teco_discriminator_sextuplet(fake, lr, self.scale, i, flow_gen, self.resampler, self.margin)
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l_step = self.compute_loss(real_sext, fake_sext)
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if l_step > self.min_loss:
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l_total += l_step
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return l_total
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# Computes the discriminator loss by dogpiling all of the sextuplets into the batch dimension and doing one massive
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# forward() on the discriminators. High memory but faster.
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def fast_forward(self, state):
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flow_gen = self.env['generators'][self.image_flow_generator]
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real = state[self.opt['real']]
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fake = state[self.opt['fake']]
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sequence_len = real.shape[1]
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lr = state[self.opt['lr_inputs']]
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# Create a list of all the discriminator inputs, which will be reduced into the batch dim for efficient computation.
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combined_real_sext = create_all_discriminator_sextuplets(real, lr, self.scale, sequence_len - 2, flow_gen,
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self.resampler, self.margin)
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combined_fake_sext = create_all_discriminator_sextuplets(fake, lr, self.scale, sequence_len - 2, flow_gen,
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self.resampler, self.margin)
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l_total = self.compute_loss(combined_real_sext, combined_fake_sext)
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if l_total < self.min_loss:
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l_total = 0
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return l_total
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def compute_loss(self, real_sext, fake_sext):
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fp16 = self.env['opt']['fp16']
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net = self.env['discriminators'][self.opt['discriminator']]
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if self.noise != 0:
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real_sext += torch.randn_like(real_sext) * self.noise
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fake_sext += torch.randn_like(fake_sext) * self.noise
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with autocast(enabled=fp16):
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d_fake = net(fake_sext)
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d_real = net(real_sext)
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self.metrics.append(("d_fake", torch.mean(d_fake)))
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self.metrics.append(("d_real", torch.mean(d_real)))
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if self.for_generator and self.env['step'] % 50 == 0:
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self.produce_teco_visual_debugs(fake_sext, 'fake', 0)
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self.produce_teco_visual_debugs(real_sext, 'real', 0)
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if self.opt['gan_type'] in ['gan', 'pixgan']:
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l_fake = self.criterion(d_fake, self.for_generator)
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if not self.for_generator:
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l_real = self.criterion(d_real, True)
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else:
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l_real = 0
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l_step = l_fake + l_real
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elif self.opt['gan_type'] == 'ragan':
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d_fake_diff = d_fake - torch.mean(d_real)
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self.metrics.append(("d_fake_diff", torch.mean(d_fake_diff)))
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l_step = (self.criterion(d_real - torch.mean(d_fake), not self.for_generator) +
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self.criterion(d_fake_diff, self.for_generator))
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else:
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raise NotImplementedError
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return l_step
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def produce_teco_visual_debugs(self, sext, lbl, it):
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if self.env['rank'] > 0:
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return
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base_path = osp.join(self.env['base_path'], "..", "visual_dbg", "teco_sext", str(self.env['step']), lbl)
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os.makedirs(base_path, exist_ok=True)
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lbls = ['img_a', 'img_b', 'img_c', 'flow_a', 'flow_b', 'flow_c']
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for i in range(6):
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torchvision.utils.save_image(sext[:, i*3:(i+1)*3, :, :].float(), osp.join(base_path, "%s_%s.png" % (it, lbls[i])))
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# This loss doesn't have a real entry - only fakes are used.
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class PingPongLoss(ConfigurableLoss):
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def __init__(self, opt, env):
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super(PingPongLoss, self).__init__(opt, env)
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self.opt = opt
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self.criterion = get_basic_criterion_for_name(opt['criterion'], env['device'])
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def forward(self, _, state):
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fake = state[self.opt['fake']]
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l_total = 0
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img_count = fake.shape[1]
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for i in range((img_count - 1) // 2):
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early = fake[:, i]
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late = fake[:, -i]
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l_total += self.criterion(early, late)
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if self.env['step'] % 50 == 0:
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self.produce_teco_visual_debugs(fake)
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return l_total
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def produce_teco_visual_debugs(self, imglist):
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if self.env['rank'] > 0:
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return
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base_path = osp.join(self.env['base_path'], "..", "visual_dbg", "teco_pingpong", str(self.env['step']))
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os.makedirs(base_path, exist_ok=True)
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cnt = imglist.shape[1]
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for i in range(cnt):
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img = imglist[:, i]
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torchvision.utils.save_image(img.float(), osp.join(base_path, "%s.png" % (i, )))
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