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259 lines
11 KiB
Python
259 lines
11 KiB
Python
"""
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Code to train model.
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"""
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import logging
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import os
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from time import time
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from typing import Dict
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import torch
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import torch.distributed as dist
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from hydra.utils import instantiate
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from omegaconf import DictConfig
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from torch.nn.parallel import DistributedDataParallel as DDP
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from torch.utils.data import DataLoader
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from mattport.nerf.dataset.collate import CollateIterDataset, collate_batch_size_one
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from mattport.nerf.dataset.image_dataset import ImageDataset, collate_batch
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from mattport.nerf.dataset.utils import DatasetInputs, get_dataset_inputs_dict
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from mattport.nerf.optimizers import Optimizers
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from mattport.utils import profiler, stats_tracker, writer
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from mattport.utils.decorators import check_main_thread
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logging.getLogger("PIL").setLevel(logging.WARNING)
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class Trainer:
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"""Training class"""
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def __init__(self, config: DictConfig, local_rank: int = 0, world_size: int = 1):
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"""_summary_
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Args:
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config (DictConfig): _description_
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local_rank (int, optional): _description_. Defaults to 0.
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world_size (int, optional): _description_. Defaults to 1.
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cpu (bool, optional): Whether or not to use the CPU.
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"""
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self.config = config
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self.local_rank = local_rank
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self.world_size = world_size
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# dataset variables
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self.train_image_dataset = None
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self.train_dataset = None
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self.train_dataloader = None
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self.val_image_dataset = None
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self.val_image_intrinsics = None
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self.val_image_camera_to_world = None
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# model variables
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self.graph = None
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self.optimizers = None
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self.start_step = 0
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# logging variables
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stats_tracker.setup_stats_tracker(config)
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writer.setup_event_writers(config.logging.writer)
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profiler.setup_profiler(config.logging)
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self.device = "cpu" if self.world_size == 0 else f"cuda:{self.local_rank}"
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@profiler.time_function
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def setup(self, test_mode=False):
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"""Setup the Trainer by calling other setup functions."""
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dataset_inputs_dict = get_dataset_inputs_dict(**self.config.data.dataset)
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self.setup_datasets(dataset_inputs_dict, test_mode=test_mode)
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self.setup_graph(dataset_inputs_dict["train"])
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def collate_fn(self, batch_list):
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"""TODO(ethan): I need to replace this.
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I'm only using this for multiprocess pickle issues for now.
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"""
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return collate_batch(batch_list, self.config.data.dataloader.num_rays_per_batch, keep_full_image=False)
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def load_test_dataset(self, dataset_inputs_dict, mode):
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"""Helper method to load test or val dataset based on test/train mode"""
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self.val_image_dataset = ImageDataset(
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image_filenames=dataset_inputs_dict[mode].image_filenames,
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downscale_factor=dataset_inputs_dict[mode].downscale_factor,
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alpha_color=dataset_inputs_dict[mode].alpha_color,
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)
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self.val_image_intrinsics = dataset_inputs_dict[mode].intrinsics
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self.val_image_camera_to_world = dataset_inputs_dict[mode].camera_to_world
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@profiler.time_function
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def setup_datasets(self, dataset_inputs_dict: Dict[str, DatasetInputs], test_mode: bool):
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"""_summary_"""
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if test_mode:
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# TODO(change "val" to "test")
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self.load_test_dataset(dataset_inputs_dict, "val")
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else:
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self.train_image_dataset = ImageDataset(
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image_filenames=dataset_inputs_dict["train"].image_filenames,
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downscale_factor=dataset_inputs_dict["train"].downscale_factor,
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alpha_color=dataset_inputs_dict["train"].alpha_color,
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)
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self.train_dataset = CollateIterDataset(
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self.train_image_dataset,
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collate_fn=self.collate_fn,
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num_samples_to_collate=self.config.data.dataloader.num_images_to_sample_from,
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num_times_to_repeat=self.config.data.dataloader.num_times_to_repeat_images,
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)
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self.train_dataloader = DataLoader(
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self.train_dataset,
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batch_size=1,
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num_workers=self.config.data.dataloader.num_workers,
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collate_fn=collate_batch_size_one,
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pin_memory=True,
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)
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self.load_test_dataset(dataset_inputs_dict, "val")
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@profiler.time_function
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def setup_graph(self, dataset_inputs: DatasetInputs):
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"""Setup the graph. The dataset inputs should be set with the training data.
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Args:
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dataset_inputs (DatasetInputs): The inputs which will be used to define the camera parameters.
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"""
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self.graph = instantiate(
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self.config.graph.network,
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intrinsics=dataset_inputs.intrinsics,
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camera_to_world=dataset_inputs.camera_to_world,
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).to(self.device)
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self.setup_optimizers() # NOTE(ethan): can this be before DDP?
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if self.config.graph.resume_train.load_dir:
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self.load_checkpoint(self.config.graph.resume_train)
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if self.world_size > 1:
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self.graph = DDP(self.graph, device_ids=[self.local_rank])
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dist.barrier(device_ids=[self.local_rank])
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def setup_optimizers(self):
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"""_summary_"""
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# TODO(ethan): handle different world sizes
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self.optimizers = Optimizers(self.config.graph.param_groups, self.graph.get_param_groups())
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def load_checkpoint(self, load_config: DictConfig) -> int:
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"""Load the checkpoint from the given path
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Args:
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load_path (str): path from which to load the model
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Returns:
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int: step iteration associated with the loaded checkpoint
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"""
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load_path = os.path.join(load_config.load_dir, f"step-{load_config.load_step:09d}.ckpt")
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assert os.path.exists(load_path), f"Checkpoint {load_path} does not exist"
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loaded_state = torch.load(load_path, map_location="cpu")
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self.graph.load_state_dict({key.replace("module.", ""): value for key, value in loaded_state["model"].items()})
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for k, v in loaded_state["optimizers"].items():
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self.optimizers.optimizers[k].load_state_dict(v)
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self.start_step = loaded_state["step"] + 1
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logging.info("done loading checkpoint from %s", load_path)
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@check_main_thread
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def save_checkpoint(self, output_dir: str, step: int) -> None:
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"""Save the model and optimizers
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Args:
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output_dir (str): directory to save the checkpoint
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step (int): number of steps in training for given checkpoint
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model (Graph): Graph model to be saved
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optimizers (Optimizers): Optimizers to be saved
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"""
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if not os.path.exists(output_dir):
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os.makedirs(output_dir)
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ckpt_path = os.path.join(output_dir, f"step-{step:09d}.ckpt")
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torch.save(
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{
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"step": step,
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"model": self.graph.module.state_dict() if hasattr(self.graph, "module") else self.graph.state_dict(),
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"optimizers": {k: v.state_dict() for (k, v) in self.optimizers.optimizers.items()},
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},
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ckpt_path,
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)
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@classmethod
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def get_aggregated_loss(cls, loss_dict: Dict[str, torch.tensor]):
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"""Returns the aggregated losses and the scalar for calling .backwards() on.
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# TODO: move this out to another file/class/etc.
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"""
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loss_sum = 0.0
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for loss_name in loss_dict.keys():
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# TODO(ethan): add loss weightings here from a config
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loss_sum += loss_dict[loss_name]
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return loss_sum
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def train(self) -> None:
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"""_summary_"""
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# self.graph.train()
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# assert self.graph.training, "Graph is not in train mode!"
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train_start = time()
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num_iterations = self.config.graph.max_num_iterations
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iter_dataset = iter(self.train_dataloader)
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for i, step in enumerate(range(self.start_step, self.start_step + num_iterations)):
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data_start = time()
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batch = next(iter_dataset)
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stats_tracker.update_stats(
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{"name": stats_tracker.Stats.ITER_LOAD_TIME, "start_time": data_start, "end_time": time(), "step": step}
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)
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iter_start = time()
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loss_dict = self.train_iteration(batch, step)
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stats_tracker.update_stats(
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{
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"name": stats_tracker.Stats.RAYS_PER_SEC,
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"start_time": iter_start,
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"end_time": time(),
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"step": step,
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"batch_size": batch["indices"].shape[0],
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},
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)
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stats_tracker.update_stats(
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{
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"name": stats_tracker.Stats.ITER_TRAIN_TIME,
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"start_time": iter_start,
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"end_time": time(),
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"step": step,
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}
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)
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if step != 0 and step % self.config.logging.steps_per_log == 0:
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writer.write_event({"scalar_dict": loss_dict, "step": step, "group": "Loss", "prefix": "train-"})
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# TODO: add the learning rates to tensorboard/logging
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if step != 0 and self.config.graph.steps_per_save and step % self.config.graph.steps_per_save == 0:
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self.save_checkpoint(self.config.graph.model_dir, step)
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if step % self.config.graph.steps_per_test == 0:
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for image_idx in self.config.data.validation_image_indices:
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_ = self.test_image(image_idx=image_idx, step=step)
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stats_tracker.print_stats(i / num_iterations)
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stats_tracker.update_stats(
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{"name": stats_tracker.Stats.TOTAL_TRAIN_TIME, "start_time": train_start, "end_time": time()}
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)
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stats_tracker.print_stats(1.0)
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@profiler.time_function
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def train_iteration(self, batch: dict, step: int):
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"""Run one iteration with a batch of inputs."""
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# move batch to correct device
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ray_indices = batch["indices"].to(self.device)
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_, loss_dict = self.graph(ray_indices, batch=batch)
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loss = loss_dict["aggregated_loss"]
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self.optimizers.zero_grad_all()
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loss.backward()
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self.optimizers.scheduler_step_all(step) # NOTE(ethan): I think the scheduler needs to know what step we are on
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self.optimizers.optimizer_step_all()
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return loss_dict
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@profiler.time_function
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def test_image(self, image_idx, step):
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"""Test a specific image."""
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self.graph.eval()
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intrinsics = self.val_image_intrinsics[image_idx]
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camera_to_world = self.val_image_camera_to_world[image_idx]
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outputs = self.graph.get_outputs_for_camera(intrinsics, camera_to_world)
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image = self.val_image_dataset[image_idx]["image"].to(self.device)
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psnr = self.graph.log_test_image_outputs(image_idx, step, image, outputs)
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self.graph.train()
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return psnr
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