experiment/transfer_learning_train&test.py

import json
import gc
import psutil
import yaml
import wget
import json
import os, sys
from glob import glob

from yolo_cam.eigen_cam import EigenCAM
from yolo_cam.utils.image import show_cam_on_image
import torch
from torchvision.utils import make_grid
import wandb
import cv2
import numpy as np

import argparse

def parse_args():
    parser = argparse.ArgumentParser(description="Transfer learning script.")
    parser.add_argument("--dataset", type=str, required=True, help='Dataset name to be used')
    parser.add_argument("--epochs", type=int, default=1000, help="Number of epochs")
    parser.add_argument("--batch", type=int, default=16, help="Batch size")
    parser.add_argument("--imgsz", type=int, default=640, help="Image size")
    parser.add_argument("--patience", type=int, default=30, help="Patience for early stopping")
    parser.add_argument("--cache", type=str, default="ram", help="Cache option")
    parser.add_argument("--pretrained", action="store_true", help="Use pretrained weights")
    parser.add_argument("--cos_lr", action="store_true", help="Use cosine learning rate")
    parser.add_argument("--profile", action="store_true", help="Profile the training")
    parser.add_argument("--plots", action="store_true", help="Generate plots")
    parser.add_argument("--resume", action="store_true", help="Resume run")
    parser.add_argument("--augment", action="store_true", help="Apply augmentation techniques during training")
    parser.add_argument("--model", type=str, required=True, help="Model name")
    parser.add_argument("--run", type=str, required=True, help="Run mode")
    
    return parser.parse_args()


args = parse_args()

dict_to_freeze = {"From_Scratch": 0,
                    "Finetuning": 0,
                    "freeze_[P1-P3]": 4,
                    "freeze_Backbone": 9,
                    "freeze_[P1-23]": 23,
}

layers_to_freeze = dict_to_freeze[args.run]
##--------------------------------------------/USER DEFINE

mem_torch = 0
RAM_used = 0
RAM_available = 0
grad_norm = []
cam_images = {}
first_batch_paths = None

args_model = {
    "epochs": args.epochs, "batch": args.batch, "imgsz": args.imgsz,
    "patience": args.patience, "cache": args.cache, "pretrained": args.pretrained,
    "cos_lr": args.cos_lr, "profile": args.profile, "plots": args.plots}

def freeze_layer(trainer):
    model = trainer.model
    num_freeze = layers_to_freeze
    print(f"Freezing {num_freeze} layers")
    if num_freeze:
        freeze = [f'model.{x}.' for x in range(num_freeze)]  # layers to freeze
        for k, v in model.named_parameters():
            v.requires_grad = True  # train all layers
            if any(x in k for x in freeze):
                print(f'freezing {k}')
                v.requires_grad = False  # Non trainable layer
    print(f"{num_freeze} layers are freezed.")
    model.info(detailed=True)

def get_gpu_usage(param):
    global mem_torch
    global RAM_used
    global RAM_available
    mem_torch = float(torch.cuda.memory_reserved() / 1E6 if torch.cuda.is_available() else 0)  #(MB)
    RAM_used = float(psutil.virtual_memory().used / 1e9)
    RAM_available = float(psutil.virtual_memory().available / 1e9)
    
def compute_gradients_L2_norm(trainer):
    model = trainer.model
    global grad_norm
    temp_grad = 0.0
    for _, params in model.named_parameters():
        if params.grad is not None:
            temp_grad += params.grad.data.norm(2).item() ** 2
    grad_norm.append(float(temp_grad ** 0.5))

def save_val_images_paths(trainer):
    global first_batch_paths
    first_batch_paths = next(iter(trainer.validator.dataloader))['im_file'][:args.batch]


def compute_grad_CAM(trainer):
    global global_step
    global cam_images
    global first_batch_paths
    if ((global_step in [1, 2, 3, 4, 5] or global_step %10 == 0) and global_step <= args.epochs):
        try:
            model_copy = YOLO(f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/weights/last.pt")
        except FileNotFoundError:
            if(global_step!=0):
                print(f"No such file or directory:  /experiment/runs/{args.dataset}/{args.model}/train_{run_name}/weights/last.pt")
            global_step += 1
            return
        iterator = [("C2fCIB [-2]", -2),("Conv [-4]", -4), ("SPPF", 9), ("PSA", 10)] if "v10" in args.model else [("Conv [-2]", -2),("Conv [-4]", -4), ("SPPF", 9)]
        json_preds_gradCAM = {layer[0] : None for layer in iterator}
        for layer_name, layer_index in iterator:
            cam_images[layer_name] = []
            target_layers = [model_copy.model.model[layer_index]]
       
            for path_to_image in first_batch_paths:
                image_name = path_to_image.split("/")[-1].split(".")[0]
                os.makedirs(f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/outs/gradCAMs_inferences/images/{image_name}/{layer_name}", exist_ok=True)
                img = cv2.cvtColor(cv2.imread(path_to_image), cv2.COLOR_BGR2RGB)
                #img = cv2.resize(img, (640, 640))
                rgb_img = img.copy()
                img = np.float32(img) / 255
                cam = EigenCAM(model_copy, target_layers, task='od')
                grayscale_cam = cam(rgb_img)[0, :, :]
                temp_cam_image = show_cam_on_image(img, grayscale_cam, use_rgb=True)
                cam = EigenCAM(model_copy, target_layers, task='od')
                grayscale_cam = cam(rgb_img)[0, :, :]
                temp_cam_image = show_cam_on_image(img, grayscale_cam, use_rgb=True)

                if (not json_preds_gradCAM[layer_name]):
                    json_preds_gradCAM[layer_name] = []

                
                boxes = model_copy.predictor.results[0].boxes.xyxy.detach().cpu().numpy()  # Get boxes as numpy array
                confs = model_copy.predictor.results[0].boxes.conf.detach().cpu().numpy()  # Get boxes as numpy array
                cam_image_annotated = temp_cam_image.copy()
                cv2.imwrite(f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/outs/gradCAMs_inferences/images/{image_name}/{layer_name}/{image_name}_gs_{global_step}.jpg", cv2.cvtColor(temp_cam_image, cv2.COLOR_BGR2RGB))
                for i, box in enumerate(boxes):
                    cam_image_annotated = cv2.rectangle(cam_image_annotated, 
                                            (int(box[0]), int(box[1])), 
                                            (int(box[2]), int(box[3])), 
                                            (0, 255, 0), 2)
                    # Prepare confidence text
                    conf_text = f"{confs[i]:.2f}"

                    # Choose the position for the text (top-left corner of the rectangle)
                    text_position = (int(box[0]), int(box[1]) - 5)  # Slightly above the top-left corner

                    # Get text size
                    (text_width, text_height), baseline = cv2.getTextSize(conf_text, 
                                                                        cv2.FONT_HERSHEY_SIMPLEX, 
                                                                        0.5, 
                                                                        1)

                    # Draw a filled rectangle as background for the text
                    background_tl = (text_position[0], text_position[1] - text_height - baseline)
                    background_br = (text_position[0] + text_width, text_position[1] + baseline)
                    cam_image_annotated = cv2.rectangle(cam_image_annotated, 
                                                        background_tl, 
                                                        background_br, 
                                                        (0, 255, 0), 
                                                        cv2.FILLED)


                    # Add text to the image
                    cam_image_annotated = cv2.putText(cam_image_annotated, 
                                                    conf_text, 
                                                    text_position, 
                                                    cv2.FONT_HERSHEY_SIMPLEX, 
                                                    0.5,  # Font scale
                                                    (0, 0, 0),  # White color
                                                    1,  # Thickness
                                                    cv2.LINE_AA)  # Anti-aliased line

                json_preds_gradCAM[layer_name].append({"image_name": image_name,
                                                       "cls" : model_copy.predictor.results[0].boxes.cls.detach().clone().tolist(),
                                                       "conf" : model_copy.predictor.results[0].boxes.conf.detach().clone().tolist(),
                                                       "boxes(xywhn)" : model_copy.predictor.results[0].boxes.xywhn.detach().clone().tolist(),
                                                       "orig_shape": model_copy.predictor.results[0].boxes.orig_shape})

                cam_images[layer_name].append(torch.from_numpy(cv2.resize(temp_cam_image, (640,640))).permute(2, 0, 1))
                
                cv2.imwrite(f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/outs/gradCAMs_inferences/images/{image_name}/{layer_name}/{image_name}_annotated_gs_{global_step}.jpg",
                            cv2.cvtColor(cam_image_annotated, cv2.COLOR_BGR2RGB))
        model_copy = None
        cam = None
        with open(f'./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/outs/gradCAMs_inferences/gradCAMS_inference_step_{global_step}.json', 'w') as f:
            # Serializing json
            json_object = json.dumps(json_preds_gradCAM, indent=4)
            f.write(json_object)

        gc.collect()
        torch.cuda.empty_cache()
    global_step += 1

def log_data(trainer):
    global grad_norm
    global mem_torch
    global RAM_used
    global RAM_available
    global global_step
    global cam_images
    grad_norm = np.array(grad_norm)
    grad_norm[grad_norm == 0] = np.nan
    grad_norm = np.nanmean(grad_norm, axis=0)
    if(cam_images and global_step <= args.epochs):
        if "v10" in args.model:
            cam_images_C2fCIB = torch.stack(cam_images["C2fCIB [-2]"])
            cam_images_PSA = torch.stack(cam_images["PSA"])
            cam_images_SPPF = torch.stack(cam_images["SPPF"])
            cam_images_Conv = torch.stack(cam_images["Conv [-4]"])

            grid_C2fCIB = wandb.Image(make_grid(cam_images_C2fCIB, nrow=int(args.batch/4)).float(), caption="C2fCIB layer")
            grid_PSA = wandb.Image(make_grid(cam_images_PSA, nrow=int(args.batch/4)).float(), caption="PSA layer")
            grid_SPPF = wandb.Image(make_grid(cam_images_SPPF, nrow=int(args.batch/4)).float(), caption="SPPF layer")
            grid_Conv = wandb.Image(make_grid(cam_images_Conv, nrow=int(args.batch/4)).float(), caption="Conv [-2] layer")

            wandb.log({"Gradients/L2 Gradients Norm": grad_norm,
                        "GPU/GPU usage Ultralytics (MB)": mem_torch,
                        "Memory/Memory used (GB):": RAM_used,
                        "Memory/Memory available (GB):": RAM_available,
                        "GradCAM/C2fCIB": grid_C2fCIB,
                        "GradCAM/SPPF": grid_SPPF,
                        "GradCAM/PSA": grid_PSA,
                        "GradCAM/Conv": grid_Conv,
                    }
                )
        elif "v8" in args.model:
            cam_images_Conv2 = torch.stack(cam_images["Conv [-2]"])
            cam_images_Conv4 = torch.stack(cam_images["Conv [-4]"])
            cam_images_SPPF = torch.stack(cam_images["SPPF"])
            grid_Conv2 = wandb.Image(make_grid(cam_images_Conv2, nrow=int(args.batch/4)).float(), caption="Conv [-2] layer")
            grid_Conv4 = wandb.Image(make_grid(cam_images_Conv4, nrow=int(args.batch/4)).float(), caption="Conv [-4] layer")
            grid_SPPF = wandb.Image(make_grid(cam_images_SPPF, nrow=int(args.batch/4)).float(), caption="SPPF layer")
            wandb.log({"Gradients/L2 Gradients Norm": grad_norm,
                        "GPU/GPU usage Ultralytics (MB)": mem_torch,
                        "Memory/Memory used (GB):": RAM_used,
                        "Memory/Memory available (GB):": RAM_available,
                        "GradCAM/Conv2": grid_Conv2,
                        "GradCAM/Conv4": grid_Conv4,
                        "GradCAM/SPPF": grid_SPPF,
                    }
                )
    elif(global_step <= args.epochs):
        wandb.log({"Gradients/L2 Gradients Norm": grad_norm,
                    "GPU/GPU usage Ultralytics (MB)": mem_torch,
                    "Memory/Memory used (GB):": RAM_used,
                    "Memory/Memory available (GB):": RAM_available
                }
            )
    cam_images = {}
    grad_norm = []
    mem_torch = None
    RAM_used = None
    RAM_available = None

ultralytics_augmentation_args_disabled = {
    "hsv_h": 0.0,
    "hsv_s": 0.0,
    "hsv_v": 0.0,
    "degrees": 0.0,
    "translate": 0.0,
    "scale": 0.0,  # Setting scale to 0.0 keeps the original size
    "shear": 0.0,
    "perspective": 0.0,
    "flipud": 0.0,
    "fliplr": 0.0,
    "mosaic": 0.0,
    "mixup": 0.0,
    "copy_paste": 0.0,
    "augment": False,  # Setting to 'none' disables auto augmentation
}
os.makedirs("./experiment/pretrained_weights", exist_ok=True)
pretrained_weights_list = [weights_path.split("/")[-1][:-3]for weights_path in glob("./experiment/pretrained_weights/*.pt")]
if args.model not in pretrained_weights_list:
    if "v10" in args.model:
        wget.download(f"https://github.com/THU-MIG/yolov10/releases/download/v1.1/{args.model}.pt", out="./experiment/pretrained_weights")
    elif "v8" in args.model:
        wget.download(f"https://github.com/ultralytics/assets/releases/download/v8.2.0/{args.model}.pt", out="./experiment/pretrained_weights")

global global_step
global_step = 0
gc.collect()
torch.cuda.empty_cache()
wandb.login(key="89873f4c9225b722e30410d7f2356b349062e603")
api = wandb.Api()

# Step 1: Initialize a Weights & Biases run
run_name = args.model.split('yolo')[-1]+"_"+args.run
wandb.init(project=f"transfer_learning_{args.dataset}",
        dir="./experiment",
        name=run_name,  # run name
        job_type="training",
        notes=f"Finetuning of {args.model} model on {args.dataset} dataset",
        tags=["object detection", "FaRADAI", "AI4TES", "Finetuning", args.dataset],
        resume="allow")

username = wandb.run.entity
project = wandb.run.project
run_id = wandb.run.id

if("From_Scratch" in run_name):
    flag_pretrained = False
    args.pretrained = flag_pretrained
else:
    flag_pretrained = True
    args.pretrained = flag_pretrained

# Step 2: Define the YOLO Model
if "v10" in args.model:
    from ultralytics import YOLOv10 as YOLO
elif "v8" in args.model:
    from ultralytics import YOLO

if(not args.pretrained):
    model = YOLO(f"{args.model}.yaml") #Necessary to doesn't initialize pretrained weights
elif args.resume:
    model = YOLO(f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/weights/last.pt")
else:
    model = YOLO(f'./experiment/pretrained_weights/{args.model}.pt')

# Step 3: Add trainer & validator callbacks
model.add_callback("on_train_start", freeze_layer)
model.add_callback("on_train_start", save_val_images_paths)

model.add_callback("on_batch_end", compute_gradients_L2_norm) #After scheduler step
model.add_callback("on_train_epoch_end", get_gpu_usage)    
model.add_callback("on_train_epoch_end", compute_grad_CAM)
model.add_callback("on_train_epoch_end", log_data)


if(not args.augment):
    args_model.update(ultralytics_augmentation_args_disabled)
    
if args.resume:
    try:
        model.train(model=f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/weights/last.pt", resume=True)
    except:
        print("Exception catched, proceeding with validation:")
        print(model.info(detailed=True))
        pass
else:
    model.train(data=f"./datasets/{args.dataset}/dataset.yaml", project=f"./experiment/runs/{args.dataset}/{args.model}", name=f"train_{run_name}", **args_model)

model.data = None
model = None  # Necessary to Free RAM

gc.collect()
torch.cuda.empty_cache()

with open(f'./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/args.yaml', 'r') as config_file:
    config = yaml.safe_load(config_file)
    config['model'] = args.model

if (layers_to_freeze!=0):
    config["freeze"] = {"number_of_layers": layers_to_freeze,
                        "layers": run_name.split("_")[1]}
else:
    config["freeze"] = {"number_of_layers": layers_to_freeze,
                    "layers": "None"}

wandb.init(entity=username,dir="./experiment", project=project, id=run_id, resume="must")
wandb.config.update(config)

model = YOLO(f"./experiment/runs/{args.dataset}/{args.model}/train_{run_name}/weights/best.pt")
metrics = model.val(data=f"../datasets/{args.dataset}/dataset.yaml",
                    imgsz=args.imgsz,
                    batch=args.batch,
                    save_json=True,
                    save_txt=True,
                    split='test',
                    plots=True,
                    conf=0.5,
                    iou=0.7,
                    project=f"./experiment/runs/{args.dataset}/{args.model}",
                    name=f"test_{run_name}"
                    )

with open(f"./experiment/runs/{args.dataset}/{args.model}/test_{run_name}/metrics.json", "w") as f:
    f.write(json.dumps(metrics.results_dict, indent=4))

wandb.log( {"test/precision(B)": metrics.results_dict["metrics/precision(B)"],
            "test/recall(B)": metrics.results_dict["metrics/recall(B)"],
            "test/mAP50(B)": metrics.results_dict["metrics/mAP50(B)"],
            "test/mAP50-95(B)": metrics.results_dict["metrics/mAP50-95(B)"],
            "test/fitness": metrics.results_dict["fitness"]
        }
        )


# Step 7: Finalize the W&B Run
wandb.finish()

model.data = None
model = None  # Necessary to Free RAM

gc.collect()
torch.cuda.empty_cache()