diff --git a/configs/debug_config.py b/configs/debug_config.py
new file mode 100644
index 0000000..06b38c4
--- /dev/null
+++ b/configs/debug_config.py
@@ -0,0 +1,25 @@
+from configs.base_config import base_config
+
+# Create a debug configuration with minimal settings
+config = base_config.copy()
+
+# Update settings for quick debugging
+config.update(
+    {
+        # Core configuration
+        "config_name": "debug_run",
+        "data_root": "data/PennFudanPed",
+        "num_classes": 2,  # background + pedestrian
+        # Minimal training parameters
+        "batch_size": 1,
+        "num_epochs": 1,  # Just one epoch for testing
+        "val_split_ratio": 0.2,  # Use more validation samples for better testing coverage
+        # Performance optimizations
+        "pin_memory": False,
+        "num_workers": 0,  # Use 0 workers to avoid multiprocessing complexities during debugging
+        # Logging settings
+        "log_freq": 1,  # Log every batch for debugging
+        # Device setting - use CPU for reliable debugging
+        "device": "cpu",  # Using CPU ensures consistent behavior across systems
+    }
+)
diff --git a/pyproject.toml b/pyproject.toml
index f16b881..639e957 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,6 +5,7 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "matplotlib>=3.10.1",
     "numpy>=2.2.4",
     "pillow>=11.1.0",
     "pytest>=8.3.5",
diff --git a/scripts/test_model.py b/scripts/test_model.py
new file mode 100755
index 0000000..8ad4bd9
--- /dev/null
+++ b/scripts/test_model.py
@@ -0,0 +1,152 @@
+#!/usr/bin/env python
+"""
+Quick model testing script to verify model creation and inference.
+"""
+
+import os
+import sys
+import time
+
+import torch
+
+# Add project root to the path to enable imports
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+from models.detection import get_maskrcnn_model
+from utils.data_utils import PennFudanDataset, get_transform
+
+
+def test_model_creation():
+    """Test that we can create the model."""
+    print("Testing model creation...")
+    model = get_maskrcnn_model(
+        num_classes=2, pretrained=False, pretrained_backbone=False
+    )
+    print("✓ Model created successfully")
+    return model
+
+
+def test_model_forward(model, device):
+    """Test model forward pass with random inputs."""
+    print("\nTesting model forward pass...")
+
+    # Create a random batch
+    image = torch.rand(3, 300, 400, device=device)  # Random image
+
+    # Create a random target
+    target = {
+        "boxes": torch.tensor(
+            [[100, 100, 200, 200]], dtype=torch.float32, device=device
+        ),
+        "labels": torch.tensor([1], dtype=torch.int64, device=device),
+        "masks": torch.randint(0, 2, (1, 300, 400), dtype=torch.uint8, device=device),
+        "image_id": torch.tensor([0], device=device),
+        "area": torch.tensor([10000.0], dtype=torch.float32, device=device),
+        "iscrowd": torch.tensor([0], dtype=torch.uint8, device=device),
+    }
+
+    # Test inference mode (no targets)
+    model.eval()
+    with torch.no_grad():
+        start_time = time.time()
+        output_inference = model([image])
+        inference_time = time.time() - start_time
+
+    # Verify inference output
+    print(f"✓ Inference mode output: {type(output_inference)}")
+    print(f"✓ Inference time: {inference_time:.3f}s")
+    print(f"✓ Detection boxes shape: {output_inference[0]['boxes'].shape}")
+    print(f"✓ Detection scores shape: {output_inference[0]['scores'].shape}")
+
+    # Test training mode (with targets)
+    model.train()
+    start_time = time.time()
+    output_train = model([image], [target])
+    train_time = time.time() - start_time
+
+    # Verify training output
+    print(f"✓ Training mode output: {type(output_train)}")
+    print(f"✓ Training time: {train_time:.3f}s")
+
+    # Print loss values
+    for loss_name, loss_value in output_train.items():
+        print(f"✓ {loss_name}: {loss_value.item():.4f}")
+
+    return output_train
+
+
+def test_model_backward(model, loss_dict, device):
+    """Test model backward pass."""
+    print("\nTesting model backward pass...")
+
+    # Calculate total loss
+    total_loss = sum(loss for loss in loss_dict.values())
+
+    # Create optimizer
+    optimizer = torch.optim.SGD(model.parameters(), lr=0.001)
+
+    # Backward pass
+    start_time = time.time()
+    optimizer.zero_grad()
+    total_loss.backward()
+    optimizer.step()
+    backward_time = time.time() - start_time
+
+    print("✓ Backward pass and optimization completed")
+    print(f"✓ Backward time: {backward_time:.3f}s")
+
+    # Check that gradients were calculated
+    has_gradients = any(
+        param.grad is not None for param in model.parameters() if param.requires_grad
+    )
+    print(f"✓ Model has gradients: {has_gradients}")
+
+
+def test_dataset():
+    """Test that we can load the dataset."""
+    print("\nTesting dataset loading...")
+
+    data_root = "data/PennFudanPed"
+    if not os.path.exists(data_root):
+        print("✗ Dataset not found at", data_root)
+        return None
+
+    # Create dataset
+    dataset = PennFudanDataset(root=data_root, transforms=get_transform(train=True))
+    print(f"✓ Dataset loaded with {len(dataset)} samples")
+
+    # Test loading a sample
+    start_time = time.time()
+    img, target = dataset[0]
+    load_time = time.time() - start_time
+
+    print(f"✓ Sample loaded in {load_time:.3f}s")
+    print(f"✓ Image shape: {img.shape}")
+    print(f"✓ Target boxes shape: {target['boxes'].shape}")
+
+    return dataset
+
+
+def main():
+    """Run all tests."""
+    print("=== Quick Model Testing Script ===")
+
+    # Set device
+    device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+    print(f"Using device: {device}")
+
+    # Run tests
+    model = test_model_creation()
+    model.to(device)
+
+    loss_dict = test_model_forward(model, device)
+
+    test_model_backward(model, loss_dict, device)
+
+    test_dataset()
+
+    print("\n=== All tests completed successfully ===")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/scripts/visualize_predictions.py b/scripts/visualize_predictions.py
new file mode 100755
index 0000000..b62dea6
--- /dev/null
+++ b/scripts/visualize_predictions.py
@@ -0,0 +1,175 @@
+#!/usr/bin/env python
+"""
+Visualization script for model predictions on the Penn-Fudan dataset.
+This helps visualize and debug model predictions.
+"""
+
+import argparse
+import os
+import sys
+
+import matplotlib.pyplot as plt
+import numpy as np
+import torch
+
+# Add project root to path for imports
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+from models.detection import get_maskrcnn_model
+from utils.common import load_checkpoint, load_config
+from utils.data_utils import PennFudanDataset, get_transform
+
+
+def visualize_prediction(image, prediction, threshold=0.5):
+    """
+    Visualize model prediction on an image.
+
+    Args:
+        image (torch.Tensor): The input image [C, H, W]
+        prediction (dict): Model prediction dict with boxes, scores, labels, masks
+        threshold (float): Score threshold for visualization
+
+    Returns:
+        plt.Figure: The matplotlib figure with the visualization
+    """
+    # Convert image from tensor to numpy
+    img_np = image.permute(1, 2, 0).cpu().numpy()
+
+    # Denormalize if needed
+    if img_np.max() <= 1.0:
+        img_np = (img_np * 255).astype(np.uint8)
+
+    # Create figure and axes
+    fig, ax = plt.subplots(1, 1, figsize=(12, 9))
+    ax.imshow(img_np)
+    ax.set_title("Model Predictions")
+
+    # Get predictions
+    boxes = prediction["boxes"].cpu().numpy()
+    scores = prediction["scores"].cpu().numpy()
+    labels = prediction["labels"].cpu().numpy()
+    masks = prediction["masks"].cpu().numpy()
+
+    # Filter by threshold
+    mask = scores >= threshold
+    boxes = boxes[mask]
+    scores = scores[mask]
+    labels = labels[mask]
+    masks = masks[mask]
+
+    # Draw predictions
+    for box, score, label, mask in zip(boxes, scores, labels, masks):
+        # Draw box
+        x1, y1, x2, y2 = box
+        rect = plt.Rectangle(
+            (x1, y1), x2 - x1, y2 - y1, fill=False, edgecolor="red", linewidth=2
+        )
+        ax.add_patch(rect)
+
+        # Add label and score
+        ax.text(
+            x1, y1, f"Person: {score:.2f}", bbox=dict(facecolor="yellow", alpha=0.5)
+        )
+
+        # Draw mask (with transparency)
+        mask = mask[0] > 0.5  # Threshold mask
+        mask_color = np.zeros((mask.shape[0], mask.shape[1], 3), dtype=np.uint8)
+        mask_color[mask] = [255, 0, 0]  # Red color
+        ax.imshow(mask_color, alpha=0.3)
+
+    # Show count of detections
+    ax.set_xlabel(f"Found {len(boxes)} pedestrians with confidence >= {threshold}")
+
+    plt.tight_layout()
+    return fig
+
+
+def run_inference(model, dataset, device, idx=0):
+    """
+    Run inference on a single image from the dataset.
+
+    Args:
+        model (torch.nn.Module): The model
+        dataset (PennFudanDataset): The dataset
+        device (torch.device): The device
+        idx (int): Index of the image to test
+
+    Returns:
+        tuple: (image, prediction)
+    """
+    # Get image
+    image, _ = dataset[idx]
+
+    # Prepare for model
+    image = image.to(device)
+
+    # Run inference
+    model.eval()
+    with torch.no_grad():
+        prediction = model([image])[0]
+
+    return image, prediction
+
+
+def main():
+    """Main entry point."""
+    parser = argparse.ArgumentParser(description="Visualize model predictions")
+    parser.add_argument("--config", required=True, help="Path to config file")
+    parser.add_argument("--checkpoint", required=True, help="Path to checkpoint file")
+    parser.add_argument("--index", type=int, default=0, help="Image index to visualize")
+    parser.add_argument("--threshold", type=float, default=0.5, help="Score threshold")
+    parser.add_argument("--output", help="Path to save visualization image")
+    args = parser.parse_args()
+
+    # Load config
+    config = load_config(args.config)
+
+    # Setup device
+    device = torch.device(config.get("device", "cpu"))
+    print(f"Using device: {device}")
+
+    # Create model
+    model = get_maskrcnn_model(
+        num_classes=config.get("num_classes", 2),
+        pretrained=False,
+        pretrained_backbone=False,
+    )
+
+    # Load checkpoint
+    checkpoint, _ = load_checkpoint(args.checkpoint, model, device)
+    model.to(device)
+    print(f"Loaded checkpoint from: {args.checkpoint}")
+
+    # Create dataset
+    data_root = config.get("data_root", "data/PennFudanPed")
+    if not os.path.exists(data_root):
+        print(f"Error: Data not found at {data_root}")
+        return
+
+    dataset = PennFudanDataset(root=data_root, transforms=get_transform(train=False))
+    print(f"Dataset loaded with {len(dataset)} images")
+
+    # Validate index
+    if args.index < 0 or args.index >= len(dataset):
+        print(f"Error: Index {args.index} out of range (0-{len(dataset)-1})")
+        return
+
+    # Run inference
+    print(f"Running inference on image {args.index}...")
+    image, prediction = run_inference(model, dataset, device, args.index)
+
+    # Visualize prediction
+    print("Visualizing predictions...")
+    fig = visualize_prediction(image, prediction, threshold=args.threshold)
+
+    # Save or show
+    if args.output:
+        fig.savefig(args.output)
+        print(f"Visualization saved to: {args.output}")
+    else:
+        plt.show()
+        print("Visualization displayed. Close window to continue.")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/test_prediction.png b/test_prediction.png
new file mode 100644
index 0000000..70bb2f0
Binary files /dev/null and b/test_prediction.png differ
diff --git a/tests/conftest.py b/tests/conftest.py
index e69de29..8a803cd 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -0,0 +1,56 @@
+import os
+import sys
+from pathlib import Path
+
+import pytest
+import torch
+
+# Add project root to the path to enable imports
+project_root = Path(__file__).parent.parent
+sys.path.insert(0, str(project_root))
+
+from models.detection import get_maskrcnn_model  # noqa: E402
+from utils.data_utils import PennFudanDataset, get_transform  # noqa: E402
+
+
+@pytest.fixture
+def device():
+    """Return CPU device for consistent testing."""
+    return torch.device("cpu")
+
+
+@pytest.fixture
+def test_config():
+    """Return a minimal config dictionary for testing."""
+    return {
+        "data_root": "data/PennFudanPed",
+        "num_classes": 2,
+        "batch_size": 1,
+        "device": "cpu",
+        "output_dir": "test_outputs",
+        "config_name": "test_run",
+    }
+
+
+@pytest.fixture
+def small_model(device):
+    """Return a small Mask R-CNN model for testing."""
+    model = get_maskrcnn_model(
+        num_classes=2, pretrained=False, pretrained_backbone=False
+    )
+    model.to(device)
+    return model
+
+
+@pytest.fixture
+def sample_dataset():
+    """Return a small dataset for testing if available."""
+    data_root = "data/PennFudanPed"
+
+    # Skip if data is not available
+    if not os.path.exists(data_root):
+        pytest.skip("Test dataset not available")
+
+    transforms = get_transform(train=False)
+    dataset = PennFudanDataset(root=data_root, transforms=transforms)
+    return dataset
diff --git a/tests/test_data_utils.py b/tests/test_data_utils.py
new file mode 100644
index 0000000..4789d24
--- /dev/null
+++ b/tests/test_data_utils.py
@@ -0,0 +1,108 @@
+import torch
+
+from utils.data_utils import collate_fn, get_transform
+
+
+def test_dataset_len(sample_dataset):
+    """Test that the dataset has the expected length."""
+    # PennFudanPed has 170 images
+    assert len(sample_dataset) > 0, "Dataset should not be empty"
+
+
+def test_dataset_getitem(sample_dataset):
+    """Test that __getitem__ returns expected format."""
+    if len(sample_dataset) == 0:
+        return  # Skip if no data
+
+    # Get first item
+    img, target = sample_dataset[0]
+
+    # Check image
+    assert isinstance(img, torch.Tensor), "Image should be a tensor"
+    assert img.dim() == 3, "Image should have 3 dimensions (C, H, W)"
+    assert img.shape[0] == 3, "Image should have 3 channels (RGB)"
+
+    # Check target
+    assert isinstance(target, dict), "Target should be a dictionary"
+    assert "boxes" in target, "Target should contain 'boxes'"
+    assert "labels" in target, "Target should contain 'labels'"
+    assert "masks" in target, "Target should contain 'masks'"
+    assert "image_id" in target, "Target should contain 'image_id'"
+    assert "area" in target, "Target should contain 'area'"
+    assert "iscrowd" in target, "Target should contain 'iscrowd'"
+
+    # Check target values
+    assert (
+        target["boxes"].shape[1] == 4
+    ), "Boxes should have 4 coordinates (x1, y1, x2, y2)"
+    assert target["labels"].dim() == 1, "Labels should be a 1D tensor"
+    assert target["masks"].dim() == 3, "Masks should be a 3D tensor (N, H, W)"
+
+
+def test_transforms(sample_dataset):
+    """Test that transforms are applied correctly."""
+    if len(sample_dataset) == 0:
+        return  # Skip if no data
+
+    # Get original transform
+    orig_transforms = sample_dataset.transforms
+
+    # Apply different transforms
+    train_transforms = get_transform(train=True)
+    eval_transforms = get_transform(train=False)
+
+    # Test that we can switch transforms
+    sample_dataset.transforms = train_transforms
+    img_train, target_train = sample_dataset[0]
+
+    sample_dataset.transforms = eval_transforms
+    img_eval, target_eval = sample_dataset[0]
+
+    # Restore original transforms
+    sample_dataset.transforms = orig_transforms
+
+    # Images should be tensors with expected properties
+    assert img_train.dim() == img_eval.dim() == 3
+    assert img_train.shape[0] == img_eval.shape[0] == 3
+
+
+def test_collate_fn():
+    """Test the collate function."""
+    # Create dummy batch data
+    dummy_img1 = torch.rand(3, 100, 100)
+    dummy_img2 = torch.rand(3, 100, 100)
+
+    dummy_target1 = {
+        "boxes": torch.tensor([[10, 10, 50, 50]], dtype=torch.float32),
+        "labels": torch.tensor([1], dtype=torch.int64),
+        "masks": torch.zeros(1, 100, 100, dtype=torch.uint8),
+        "image_id": torch.tensor([0]),
+        "area": torch.tensor([1600.0], dtype=torch.float32),
+        "iscrowd": torch.tensor([0], dtype=torch.uint8),
+    }
+
+    dummy_target2 = {
+        "boxes": torch.tensor([[20, 20, 60, 60]], dtype=torch.float32),
+        "labels": torch.tensor([1], dtype=torch.int64),
+        "masks": torch.zeros(1, 100, 100, dtype=torch.uint8),
+        "image_id": torch.tensor([1]),
+        "area": torch.tensor([1600.0], dtype=torch.float32),
+        "iscrowd": torch.tensor([0], dtype=torch.uint8),
+    }
+
+    batch = [(dummy_img1, dummy_target1), (dummy_img2, dummy_target2)]
+
+    # Apply collate_fn
+    images, targets = collate_fn(batch)
+
+    # Check results
+    assert len(images) == 2, "Should have 2 images"
+    assert len(targets) == 2, "Should have 2 targets"
+    assert torch.allclose(images[0], dummy_img1), "First image should match"
+    assert torch.allclose(images[1], dummy_img2), "Second image should match"
+    assert torch.allclose(
+        targets[0]["boxes"], dummy_target1["boxes"]
+    ), "First boxes should match"
+    assert torch.allclose(
+        targets[1]["boxes"], dummy_target2["boxes"]
+    ), "Second boxes should match"
diff --git a/tests/test_model.py b/tests/test_model.py
new file mode 100644
index 0000000..cba45a9
--- /dev/null
+++ b/tests/test_model.py
@@ -0,0 +1,102 @@
+import torch
+import torchvision
+
+from utils.eval_utils import evaluate
+
+
+def test_model_creation(small_model):
+    """Test that the model is created correctly."""
+    assert isinstance(small_model, torchvision.models.detection.MaskRCNN)
+    assert small_model.roi_heads.box_predictor.cls_score.out_features == 2
+    assert small_model.roi_heads.mask_predictor.mask_fcn_logits.out_channels == 2
+
+
+def test_model_forward_train_mode(small_model, sample_dataset, device):
+    """Test model forward pass in training mode."""
+    if len(sample_dataset) == 0:
+        return  # Skip if no data
+
+    # Set model to training mode
+    small_model.train()
+
+    # Get a batch
+    img, target = sample_dataset[0]
+    img = img.to(device)
+    target = {k: v.to(device) for k, v in target.items()}
+
+    # Forward pass with targets should return loss dict in training mode
+    loss_dict = small_model([img], [target])
+
+    # Verify loss dict structure
+    assert isinstance(loss_dict, dict), "Loss should be a dictionary"
+    assert "loss_classifier" in loss_dict, "Should have classifier loss"
+    assert "loss_box_reg" in loss_dict, "Should have box regression loss"
+    assert "loss_mask" in loss_dict, "Should have mask loss"
+    assert "loss_objectness" in loss_dict, "Should have objectness loss"
+    assert "loss_rpn_box_reg" in loss_dict, "Should have RPN box regression loss"
+
+    # Verify loss values
+    for loss_name, loss_value in loss_dict.items():
+        assert isinstance(loss_value, torch.Tensor), f"{loss_name} should be a tensor"
+        assert loss_value.dim() == 0, f"{loss_name} should be a scalar tensor"
+        assert not torch.isnan(loss_value), f"{loss_name} should not be NaN"
+        assert not torch.isinf(loss_value), f"{loss_name} should not be infinite"
+
+
+def test_model_forward_eval_mode(small_model, sample_dataset, device):
+    """Test model forward pass in evaluation mode."""
+    if len(sample_dataset) == 0:
+        return  # Skip if no data
+
+    # Set model to evaluation mode
+    small_model.eval()
+
+    # Get a batch
+    img, target = sample_dataset[0]
+    img = img.to(device)
+
+    # Forward pass without targets should return predictions in eval mode
+    with torch.no_grad():
+        predictions = small_model([img])
+
+    # Verify predictions structure
+    assert isinstance(predictions, list), "Predictions should be a list"
+    assert len(predictions) == 1, "Should have predictions for 1 image"
+
+    pred = predictions[0]
+    assert "boxes" in pred, "Predictions should contain 'boxes'"
+    assert "scores" in pred, "Predictions should contain 'scores'"
+    assert "labels" in pred, "Predictions should contain 'labels'"
+    assert "masks" in pred, "Predictions should contain 'masks'"
+
+
+def test_evaluate_function(small_model, sample_dataset, device):
+    """Test the evaluate function."""
+    if len(sample_dataset) == 0:
+        return  # Skip if no data
+
+    # Create a tiny dataloader for testing
+    from torch.utils.data import DataLoader
+
+    from utils.data_utils import collate_fn
+
+    # Use only 2 samples for quick testing
+    small_ds = torch.utils.data.Subset(
+        sample_dataset, range(min(2, len(sample_dataset)))
+    )
+    dataloader = DataLoader(
+        small_ds, batch_size=1, shuffle=False, collate_fn=collate_fn
+    )
+
+    # Set model to eval mode
+    small_model.eval()
+
+    # Import evaluate function
+
+    # Run evaluation
+    metrics = evaluate(small_model, dataloader, device)
+
+    # Check results
+    assert isinstance(metrics, dict), "Metrics should be a dictionary"
+    assert "average_loss" in metrics, "Metrics should contain 'average_loss'"
+    assert metrics["average_loss"] >= 0, "Loss should be non-negative"
diff --git a/tests/test_visualization.py b/tests/test_visualization.py
new file mode 100644
index 0000000..4eb51ee
--- /dev/null
+++ b/tests/test_visualization.py
@@ -0,0 +1,77 @@
+import os
+import sys
+
+import matplotlib.pyplot as plt
+import torch
+
+# Import visualization functions
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+from scripts.visualize_predictions import visualize_prediction
+
+
+def test_visualize_prediction():
+    """Test that the visualization function works."""
+    # Create a dummy image tensor
+    image = torch.rand(3, 400, 600)
+
+    # Create a dummy prediction dictionary
+    prediction = {
+        "boxes": torch.tensor(
+            [[100, 100, 200, 200], [300, 300, 400, 400]], dtype=torch.float32
+        ),
+        "scores": torch.tensor([0.9, 0.7], dtype=torch.float32),
+        "labels": torch.tensor([1, 1], dtype=torch.int64),
+        "masks": torch.zeros(2, 1, 400, 600, dtype=torch.float32),
+    }
+
+    # Set some pixels in the mask to 1
+    prediction["masks"][0, 0, 100:200, 100:200] = 1.0
+    prediction["masks"][1, 0, 300:400, 300:400] = 1.0
+
+    # Call the visualization function
+    fig = visualize_prediction(image, prediction, threshold=0.5)
+
+    # Check that a figure was returned
+    assert isinstance(fig, plt.Figure)
+
+    # Check figure properties
+    assert len(fig.axes) == 1
+
+    # Close the figure to avoid memory leaks
+    plt.close(fig)
+
+
+def test_visualize_prediction_threshold():
+    """Test that the threshold parameter filters predictions correctly."""
+    # Create a dummy image tensor
+    image = torch.rand(3, 400, 600)
+
+    # Create a dummy prediction dictionary with varying scores
+    prediction = {
+        "boxes": torch.tensor(
+            [[100, 100, 200, 200], [300, 300, 400, 400], [500, 100, 550, 150]],
+            dtype=torch.float32,
+        ),
+        "scores": torch.tensor([0.9, 0.7, 0.3], dtype=torch.float32),
+        "labels": torch.tensor([1, 1, 1], dtype=torch.int64),
+        "masks": torch.zeros(3, 1, 400, 600, dtype=torch.float32),
+    }
+
+    # Call the visualization function with different thresholds
+    fig_low = visualize_prediction(image, prediction, threshold=0.2)
+    fig_med = visualize_prediction(image, prediction, threshold=0.5)
+    fig_high = visualize_prediction(image, prediction, threshold=0.8)
+
+    # Low threshold should show all 3 boxes
+    assert "Found 3" in fig_low.axes[0].get_xlabel()
+
+    # Medium threshold should show 2 boxes
+    assert "Found 2" in fig_med.axes[0].get_xlabel()
+
+    # High threshold should show 1 box
+    assert "Found 1" in fig_high.axes[0].get_xlabel()
+
+    # Close figures
+    plt.close(fig_low)
+    plt.close(fig_med)
+    plt.close(fig_high)
diff --git a/train.py b/train.py
index f17a17c..6d66afe 100644
--- a/train.py
+++ b/train.py
@@ -310,7 +310,7 @@ def main(args):
             "num_epochs", 10
         ) - 1:
             checkpoint_file = os.path.join(
-                checkpoint_path, f"checkpoint_epoch_{epoch + 1}.pth"
+                checkpoint_path, f"checkpoint_epoch_{epoch+1}.pth"
             )
             checkpoint = {
                 "epoch": epoch + 1,
diff --git a/utils/data_utils.py b/utils/data_utils.py
index dc33147..b4617eb 100644
--- a/utils/data_utils.py
+++ b/utils/data_utils.py
@@ -18,80 +18,91 @@ class PennFudanDataset(torch.utils.data.Dataset):
         self.masks = sorted(list(os.listdir(os.path.join(root, "PedMasks"))))
 
     def __getitem__(self, idx):
-        # Load images and masks
+        """Get a sample from the dataset.
+
+        Args:
+            idx (int): Index of the sample to retrieve.
+
+        Returns:
+            tuple: (image, target) where target is a dictionary containing various object annotations.
+        """
+        # Load image
         img_path = os.path.join(self.root, "PNGImages", self.imgs[idx])
         mask_path = os.path.join(self.root, "PedMasks", self.masks[idx])
+
+        # Use PIL to load images (more memory efficient)
         img = Image.open(img_path).convert("RGB")
-        # Note: Masks are not converted to RGB, contains index values
         mask = Image.open(mask_path)
 
-        # Convert mask to numpy array
+        # Convert mask PIL image to numpy array
         mask = np.array(mask)
-        # Instances are encoded as different colors
+
+        # Find all object instances (each instance has a unique value in the mask)
+        # Value 0 is the background
         obj_ids = np.unique(mask)
-        # First id is the background, so remove it
-        obj_ids = obj_ids[1:]
+        obj_ids = obj_ids[1:]  # Remove background (id=0)
 
-        # Split the color-encoded mask into a set of binary masks
-        binary_masks = mask == obj_ids[:, None, None]
+        # Split the mask into binary masks for each object instance
+        masks = mask == obj_ids[:, None, None]
 
-        # Get bounding box coordinates for each mask
+        # Get bounding box for each mask
         num_objs = len(obj_ids)
         boxes = []
+
         for i in range(num_objs):
-            pos = np.where(binary_masks[i])
+            pos = np.where(masks[i])
+            if len(pos[0]) == 0 or len(pos[1]) == 0:  # Skip empty masks
+                continue
+
             xmin = np.min(pos[1])
             xmax = np.max(pos[1])
             ymin = np.min(pos[0])
             ymax = np.max(pos[0])
-            # Filter out potentially empty masks or masks with zero area
-            if xmax > xmin and ymax > ymin:
-                boxes.append([xmin, ymin, xmax, ymax])
-            else:
-                # If box is invalid, we might need to handle this
-                # For now, let's remove the corresponding mask as well
-                # This requires careful index handling if filtering occurs
-                # A safer approach might be to filter masks *after* box generation
-                # Let's recalculate binary_masks based on valid boxes later if needed
-                pass  # placeholder for potential filtering logic
 
-        # Ensure boxes list isn't empty if filtering happened
-        if not boxes:
-            # Handle case with no valid boxes found - return dummy target? Or raise error?
-            # For now, let's create dummy tensors. This should be revisited.
-            print(
-                f"Warning: No valid boxes found for image {idx}. Returning dummy target."
-            )
-            boxes = torch.zeros((0, 4), dtype=torch.float32)
-            labels = torch.zeros((0,), dtype=torch.int64)
-            binary_masks = torch.zeros(
-                (0, mask.shape[0], mask.shape[1]), dtype=torch.uint8
-            )
-            image_id = torch.tensor([idx])
-            area = torch.zeros((0,), dtype=torch.float32)
-            iscrowd = torch.zeros((0,), dtype=torch.uint8)
-        else:
+            # Skip boxes with zero area
+            if xmax <= xmin or ymax <= ymin:
+                continue
+
+            boxes.append([xmin, ymin, xmax, ymax])
+
+        # Convert everything to tensors
+        if boxes:
             boxes = torch.as_tensor(boxes, dtype=torch.float32)
-            # There is only one class (pedestrian)
-            labels = torch.ones((num_objs,), dtype=torch.int64)
-            binary_masks = torch.as_tensor(binary_masks, dtype=torch.uint8)
-            image_id = torch.tensor([idx])
-            # Calculate area
+            labels = torch.ones(
+                (len(boxes),), dtype=torch.int64
+            )  # All objects are pedestrians (class 1)
+            masks = torch.as_tensor(masks, dtype=torch.uint8)
+
+            # Calculate area of each box
             area = (boxes[:, 3] - boxes[:, 1]) * (boxes[:, 2] - boxes[:, 0])
-            # Assume all instances are not crowd
-            iscrowd = torch.zeros((num_objs,), dtype=torch.uint8)
 
-        target = {}
-        target["boxes"] = boxes
-        target["labels"] = labels
-        target["masks"] = binary_masks
-        target["image_id"] = image_id
-        target["area"] = area
-        target["iscrowd"] = iscrowd
+            # All instances are not crowd
+            iscrowd = torch.zeros((len(boxes),), dtype=torch.uint8)
 
+            # Create the target dictionary
+            target = {
+                "boxes": boxes,
+                "labels": labels,
+                "masks": masks,
+                "image_id": torch.tensor([idx]),
+                "area": area,
+                "iscrowd": iscrowd,
+            }
+        else:
+            # Handle case with no valid objects (rare but possible)
+            target = {
+                "boxes": torch.zeros((0, 4), dtype=torch.float32),
+                "labels": torch.zeros((0,), dtype=torch.int64),
+                "masks": torch.zeros(
+                    (0, mask.shape[0], mask.shape[1]), dtype=torch.uint8
+                ),
+                "image_id": torch.tensor([idx]),
+                "area": torch.zeros((0,), dtype=torch.float32),
+                "iscrowd": torch.zeros((0,), dtype=torch.uint8),
+            }
+
+        # Apply transforms if provided
         if self.transforms is not None:
-            # Apply transforms to both image and target
-            # Note: torchvision v2 transforms handle target dicts automatically
             img, target = self.transforms(img, target)
 
         return img, target
@@ -117,15 +128,18 @@ def get_transform(train):
     # Convert to PyTorch tensor and normalize
     transforms.append(T.ToImage())
 
-    # Add resize transform to reduce memory usage (max size of 800px)
-    transforms.append(T.Resize(800))
+    # Resize images to control memory usage
+    # Use a smaller size for training (more memory-intensive due to gradients)
+    if train:
+        transforms.append(T.Resize(700))
+    else:
+        transforms.append(T.Resize(800))  # Can use larger size for eval
 
     transforms.append(T.ToDtype(torch.float32, scale=True))
 
     # Data augmentation for training
     if train:
         transforms.append(T.RandomHorizontalFlip(0.5))
-        # Could add more augmentations here if desired
 
     return T.Compose(transforms)
 
diff --git a/utils/eval_utils.py b/utils/eval_utils.py
index c882cd5..4c765ad 100644
--- a/utils/eval_utils.py
+++ b/utils/eval_utils.py
@@ -28,9 +28,13 @@ def evaluate(model, data_loader, device):
             images = list(image.to(device) for image in images)
             targets = [{k: v.to(device) for k, v in t.items()} for t in targets]
 
-            # In eval mode with targets, Mask R-CNN should still return losses
-            # If it returned predictions, logic here would change to process predictions
+            # To handle the different behavior of Mask R-CNN in eval mode,
+            # we explicitly reset the model to training mode to compute losses,
+            # then switch back to eval mode for the rest of the evaluation
+            model.train()
             loss_dict = model(images, targets)
+            model.eval()
+
             losses = sum(loss for loss in loss_dict.values())
             loss_value = losses.item()
             total_loss += loss_value
diff --git a/uv.lock b/uv.lock
index 71faa6b..287fc3e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -24,6 +24,56 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/d1/d6/3965ed04c63042e047cb6a3e6ed1a63a35087b6a609aa3a15ed8ac56c221/colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6", size = 25335 },
 ]
 
+[[package]]
+name = "contourpy"
+version = "1.3.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "numpy" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/25/c2/fc7193cc5383637ff390a712e88e4ded0452c9fbcf84abe3de5ea3df1866/contourpy-1.3.1.tar.gz", hash = "sha256:dfd97abd83335045a913e3bcc4a09c0ceadbe66580cf573fe961f4a825efa699", size = 13465753 }
+wheels = [
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