242 lines
8.5 KiB
Python
242 lines
8.5 KiB
Python
import argparse
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import importlib.util
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import logging
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import os
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import random
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import sys
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import numpy as np
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import torch
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import torch.utils.data
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# Project specific imports
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from models.detection import get_maskrcnn_model
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from utils.data_utils import PennFudanDataset, collate_fn, get_transform
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from utils.log_utils import setup_logging
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def main(args):
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# --- Configuration Loading ---
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try:
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config_path = os.path.abspath(args.config)
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if not os.path.exists(config_path):
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print(f"Error: Config file not found at {config_path}")
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sys.exit(1)
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# Derive module path from file path relative to workspace root
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workspace_root = os.path.abspath(
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os.getcwd()
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) # Assuming script is run from root
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relative_path = os.path.relpath(config_path, workspace_root)
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if relative_path.startswith(".."):
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print(f"Error: Config file {args.config} is outside the project directory.")
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sys.exit(1)
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module_path_no_ext, _ = os.path.splitext(relative_path)
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module_path_str = module_path_no_ext.replace(os.sep, ".")
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print(f"Attempting to import config module: {module_path_str}")
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config_module = importlib.import_module(module_path_str)
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config = config_module.config
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print(
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f"Loaded configuration from: {config_path} (via module {module_path_str})"
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)
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except ImportError as e:
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print(f"Error importing config module '{module_path_str}': {e}")
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print(
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"Ensure the config file path is correct and relative imports within it are valid."
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)
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import traceback
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traceback.print_exc()
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sys.exit(1)
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except AttributeError as e:
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print(
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f"Error: Could not find 'config' dictionary in module {module_path_str}. {e}"
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)
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sys.exit(1)
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except Exception as e:
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print(f"Error loading configuration file {args.config}: {e}")
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import traceback
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traceback.print_exc()
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sys.exit(1)
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# --- Output Directory Setup ---
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output_dir = config.get("output_dir", "outputs")
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config_name = config.get("config_name", "default_run")
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output_path = os.path.join(output_dir, config_name)
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checkpoint_path = os.path.join(output_path, "checkpoints")
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os.makedirs(output_path, exist_ok=True)
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os.makedirs(checkpoint_path, exist_ok=True)
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print(f"Output will be saved to: {output_path}")
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# --- Logging Setup (Prompt 9) ---
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setup_logging(output_path, config_name)
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logging.info("--- Training Script Started ---")
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logging.info(f"Loaded configuration from: {args.config}")
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logging.info(f"Loaded configuration dictionary: {config}")
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logging.info(f"Output will be saved to: {output_path}")
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# --- Reproducibility ---
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seed = config.get("seed", 42)
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random.seed(seed)
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np.random.seed(seed)
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torch.manual_seed(seed)
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if torch.cuda.is_available():
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torch.cuda.manual_seed_all(seed)
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# Consider adding these for more determinism, but they might impact performance
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# torch.backends.cudnn.deterministic = True
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# torch.backends.cudnn.benchmark = False
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logging.info(f"Set random seed to: {seed}")
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# --- Device Setup ---
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device_name = config.get("device", "cuda")
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if device_name == "cuda" and not torch.cuda.is_available():
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logging.warning("CUDA requested but not available, falling back to CPU.")
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device_name = "cpu"
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device = torch.device(device_name)
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logging.info(f"Using device: {device}")
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# --- Dataset and DataLoader ---
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data_root = config.get("data_root")
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if not data_root or not os.path.isdir(data_root):
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logging.error(f"Data root directory not found or not specified: {data_root}")
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sys.exit(1)
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try:
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dataset_train = PennFudanDataset(
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root=data_root, transforms=get_transform(train=True)
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)
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# Note: Validation split will be handled later (Prompt 12)
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# dataset_val = PennFudanDataset(root=data_root, transforms=get_transform(train=False))
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# TODO: Implement data splitting (e.g., using torch.utils.data.Subset)
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data_loader_train = torch.utils.data.DataLoader(
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dataset_train,
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batch_size=config.get("batch_size", 2),
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shuffle=True,
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num_workers=config.get("num_workers", 4),
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collate_fn=collate_fn,
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pin_memory=config.get(
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"pin_memory", True
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), # Often improves GPU transfer speed
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)
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logging.info(f"Training dataset size: {len(dataset_train)}")
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logging.info(
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f"Training dataloader configured with batch size {config.get('batch_size', 2)}"
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)
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# Placeholder for validation loader
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# data_loader_val = torch.utils.data.DataLoader(...)
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except Exception as e:
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logging.error(f"Error setting up dataset/dataloader: {e}", exc_info=True)
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sys.exit(1)
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# --- Model Instantiation ---
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num_classes = config.get("num_classes")
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if num_classes is None:
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logging.error("'num_classes' not specified in configuration.")
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sys.exit(1)
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try:
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model = get_maskrcnn_model(
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num_classes=num_classes,
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pretrained=config.get("pretrained", True),
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pretrained_backbone=config.get("pretrained_backbone", True),
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)
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model.to(device)
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logging.info("Model loaded successfully.")
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except Exception as e:
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logging.error(f"Error loading model: {e}", exc_info=True)
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sys.exit(1)
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# --- Optimizer ---
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# Filter parameters that require gradients
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params = [p for p in model.parameters() if p.requires_grad]
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try:
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optimizer = torch.optim.SGD(
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params,
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lr=config.get("lr", 0.005),
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momentum=config.get("momentum", 0.9),
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weight_decay=config.get("weight_decay", 0.0005),
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)
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logging.info(
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f"Optimizer SGD configured with lr={config.get('lr', 0.005)}, momentum={config.get('momentum', 0.9)}, weight_decay={config.get('weight_decay', 0.0005)}"
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)
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except Exception as e:
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logging.error(f"Error creating optimizer: {e}", exc_info=True)
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sys.exit(1)
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# --- LR Scheduler (Placeholder for Prompt 10) ---
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# lr_scheduler = torch.optim.lr_scheduler.StepLR(
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# optimizer,
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# step_size=config.get('lr_step_size', 3),
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# gamma=config.get('lr_gamma', 0.1)
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# )
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# --- Minimal Training Step (Prompt 8 / Updated for Prompt 9) ---
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logging.info("--- Starting Minimal Training Step --- ")
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model.train() # Set model to training mode
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try:
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# Fetch one batch
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images, targets = next(iter(data_loader_train))
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# Move data to the device
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images = list(image.to(device) for image in images)
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# Targets is a list of dicts. Move each tensor in the dict to the device.
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targets = [{k: v.to(device) for k, v in t.items()} for t in targets]
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# Perform forward pass (model returns loss dict in train mode)
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loss_dict = model(images, targets)
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# Calculate total loss
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losses = sum(loss for loss in loss_dict.values())
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loss_value = losses.item() # Get scalar value
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# Perform backward pass
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optimizer.zero_grad() # Clear previous gradients
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losses.backward() # Compute gradients
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optimizer.step() # Update weights
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# Convert loss_dict tensors to scalar values for logging
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loss_dict_log = {k: v.item() for k, v in loss_dict.items()}
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logging.info(f"Single step loss dict: {loss_dict_log}")
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logging.info(f"Single step total loss: {loss_value:.4f}")
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logging.info("--- Minimal Training Step Completed Successfully --- ")
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except Exception as e:
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logging.error(f"Error during minimal training step: {e}", exc_info=True)
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import traceback
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# traceback.print_exc() # Already logged with exc_info=True
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sys.exit(1)
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# Temporarily exit after the single step (as per Prompt 8)
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logging.info("Exiting after single training step.")
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sys.exit(0)
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# --- Full Training Loop (Placeholder for Prompt 10) ---
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# print("Basic setup complete. Full training loop implementation pending.")
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# ... loop implementation ...
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(
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description="Train Mask R-CNN on Penn-Fudan dataset."
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)
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parser.add_argument(
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"--config",
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type=str,
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required=True,
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help="Path to the Python configuration file (e.g., configs/pennfudan_maskrcnn_config.py)",
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)
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args = parser.parse_args()
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main(args)
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