diff --git a/DeepDataMiningLearning/detection/dataset.py b/DeepDataMiningLearning/detection/dataset.py
index ed252f6..d55d7af 100644
--- a/DeepDataMiningLearning/detection/dataset.py
+++ b/DeepDataMiningLearning/detection/dataset.py
@@ -8,6 +8,7 @@
 from PIL import Image
 import csv
 from DeepDataMiningLearning.detection.dataset_kitti import KittiDataset
+from DeepDataMiningLearning.detection.dataset_nuscene import NuscenesDataset
 from DeepDataMiningLearning.detection.dataset_waymococo import WaymoCOCODataset
 from collections import defaultdict
 
@@ -157,6 +158,8 @@ def get_dataset(datasetname, is_train, is_val, args):
         ds, num_classes = get_waymococodataset(is_train, is_val, args)
     elif datasetname.lower() == 'yolo':
         ds, num_classes = get_yolodataset(is_train, is_val, args)
+    elif datasetname.lower() == 'nuscene':
+        ds, num_classes = get_nuscenedataset(is_train, is_val, args)
     return ds, num_classes
 
 def get_transform(is_train, args):
@@ -185,6 +188,22 @@ def get_cocodataset(is_train, is_val, args):
     )
     return ds, num_classes
 
+# Utility method to load nuScenes dataset
+def get_nuscenedataset(is_train, is_val, args):
+    rootPath=args.data_path
+    if is_val == True:
+        transformfunc=get_transform(False, args)
+        metadata_subdir = 'v1.0-mini'  # small dataset for development
+        metadata_subdir = 'v1.0-train' # full training dataset
+        dataset = NuscenesDataset(rootPath, metadata_subdir=metadata_subdir, train=True, transform=transformfunc)
+    else: #Training
+        transformfunc=get_transform(True, args) #add augumentation
+        metadata_subdir = 'v1.0-mini' # small dataset for development
+        metadata_subdir = 'v1.0-val'  # full validation dataset
+        dataset = NuscenesDataset(rootPath, metadata_subdir=metadata_subdir, train=is_train, transform=transformfunc)
+
+    num_classes = dataset.numclass
+    return dataset, num_classes
    
 def get_kittidataset(is_train, is_val, args):
     rootPath=args.data_path
diff --git a/DeepDataMiningLearning/detection/dataset_nuscene.py b/DeepDataMiningLearning/detection/dataset_nuscene.py
new file mode 100644
index 0000000..4fb53ad
--- /dev/null
+++ b/DeepDataMiningLearning/detection/dataset_nuscene.py
@@ -0,0 +1,224 @@
+import random
+import torch
+from torch.utils.data import Dataset
+from typing import Any, Callable, List, Optional, Tuple
+import os
+import numpy as np
+import json
+from PIL import Image
+from pathlib import Path
+
+# Nuscenes dataset class
+# This class is used to load nuScenes dataset.
+# Ref: https://www.nuscenes.org/
+#
+# Mini dataset for development
+# metadata and image -
+# https://motional-nuscenes.s3-ap-northeast-1.amazonaws.com/public/nuimages-v1.0/nuimages-v1.0-mini.tgz
+# Full dataset for training
+# metdata - https://motional-nuscenes.s3-ap-northeast-1.amazonaws.com/public/nuimages-v1.0/nuimages-v1.0-all-metadata.tgz
+# images - https://motional-nuscenes.s3-ap-northeast-1.amazonaws.com/public/nuimages-v1.0/nuimages-v1.0-all-samples.tgz
+# Extract all files in <data_dir>
+class NuscenesDataset(Dataset):
+    ## Nuscenes dataset class initialization
+    # Args:
+    # data_dir: str: Path to the data directory
+    # train: bool: True if training dataset, False otherwise
+    # sample_data_file: str: Name of the sample_data.json file
+    # transform: Optional[Callable]: Transform to apply to the image
+    def __init__(self, 
+                 data_dir: str,
+                 metadata_subdir: str = 'v1.0-mini',
+                 train: bool = True,
+                 transform: Optional[Callable] = None):
+        self.data_dir = data_dir
+        self.train = train
+        self.transform = transform
+        self.metadata_dir = os.path.join(data_dir, metadata_subdir)
+
+        # Read categories
+        self.read_categories()
+        self.numclass = len(self.INSTANCE_CATEGORY_NAMES)
+
+        # Read annotations
+        self.read_annotations()
+
+        # Read sample_data.json
+        self.sample_data_list = []
+        sample_data_path = os.path.join(self.metadata_dir, 'sample_data.json')
+        with open(sample_data_path, 'r') as f:
+            samples_list = json.load(f)
+            # only keep files for which annotations are available
+            i = -1
+            for sample in samples_list:
+                token = sample['token']
+                if token in self.annotations:
+                    i = i + 1
+                    self.sample_data_list.append({
+                        'image_id': i,
+                        'filename': sample['filename'],
+                        'token': sample['token']
+                    })
+        
+
+    def __len__(self):
+        return len(self.sample_data_list)
+
+    def __getitem__(self, idx: int) -> Tuple[Any, Any]:
+        """Get item at a given index.
+
+        Args:
+            idx (int): Index
+        Returns:
+            tuple: (image, target), where
+            target is a list of dictionaries with the following keys:
+
+            - type: str
+            - truncated: float
+            - occluded: int
+            - alpha: float
+            - bbox: float[4]
+            - dimensions: float[3]
+            - locations: float[3]
+            - rotation_y: float
+
+        """
+        if idx>len(self.sample_data_list):
+            print("Index out-of-range")
+            image = None
+        else:
+            sample_data = self.sample_data_list[idx]
+            image_file = sample_data['filename']
+            image_path = Path(os.path.join(self.data_dir, image_file))
+            if not image_path.exists():
+                raise FileNotFoundError(f"Image file {image_path} does not exist")
+            image = Image.open(image_path)
+            if self.train:
+                target = self.get_label(idx) #list of dicts
+
+        if self.transform:
+            image, target = self.transform(image, target)
+        return image, target
+    
+    # read annotation files
+    # In nuScene dataset, each image has a unique token and corresponding annotations
+    # are stored in object_ann.json file. 
+    # Token in sample_data.json maps to sample_data_token in object_ann.json
+    def read_annotations(self):
+        anns = {}
+        with open(os.path.join(self.metadata_dir, 'object_ann.json'), 'r') as f:
+            ann_list = json.load(f)
+            for ann in ann_list:
+                image_key = ann['sample_data_token']
+                image_ann_list = []
+                # check if anns has the key 
+                if image_key not in anns:
+                    anns[image_key] = image_ann_list
+                else:
+                    image_ann_list = anns[image_key]
+
+                image_ann_list.append({
+                    'bbox': ann['bbox'],
+                    'category_token': ann['category_token']
+                })
+        self.annotations = anns
+        return
+
+    # Read category.jso and create a list of category names
+    # nuScene dataset has token (unique id) for each category, create a map of token
+    # to index in the list of category names
+    def read_categories(self):
+        categories = []
+        category_token_idx_map = {}
+        category_names = []
+
+        with open(os.path.join(self.metadata_dir, 'category.json'), 'r') as f:
+            categories = json.load(f)
+        # populate category_token_id_map and category_names
+        for i, category in enumerate(categories):
+            category_token_idx_map[category['token']] = i
+            category_names.append(category['name'])
+
+        self.INSTANCE_CATEGORY_NAMES = category_names
+        self.INSTANCE_CATEGORY_TOKEN2IDX = category_token_idx_map
+        return
+    
+    # Get label for image at a given index
+    # Returns a dictionary with keys: boxes, labels, image_id, area, iscrowd
+    # Values are tensors for each key
+    def get_label(self, idx: int) -> dict:
+        annotations = self.annotations.get(self.sample_data_list[idx]['token'], [])
+        boxes = []
+        labels = []
+        for ann in annotations:
+            category_idx = self.INSTANCE_CATEGORY_TOKEN2IDX[ann['category_token']]
+            boxes.append(ann['bbox'])
+            labels.append(category_idx)
+
+        num_objs = len(labels) #update num_objs
+        newtarget = {}
+        # convert everything into a torch.Tensor
+        boxes = torch.as_tensor(boxes, dtype=torch.float32)
+        labels = torch.as_tensor(labels, dtype=torch.int64)
+        area = (boxes[:, 3] - boxes[:, 1]) * (boxes[:, 2] - boxes[:, 0])
+        # suppose all instances are not crowd
+        iscrowd = torch.zeros((num_objs,), dtype=torch.int64)
+        if num_objs >0:
+            newtarget["boxes"] = boxes
+            newtarget["labels"] = labels
+            #newtarget["masks"] = masks
+            newtarget["image_id"] = idx
+            newtarget["area"] = area
+            newtarget["iscrowd"] = iscrowd
+        else:
+            #negative example, ref: https://github.com/pytorch/vision/issues/2144
+            newtarget['boxes'] = torch.zeros((0, 4), dtype=torch.float32) #not empty
+        return newtarget
+    
+
+# Test the dataset
+# It loads the dataset and modify a random image with bounding boxes and corresponding
+# labels. Modified image is saved to disk (<data_dir>/out.png) for verification.
+#
+# This demonstrates that the dataset is loaded properly and can be used for training
+if __name__ == "__main__":
+    data_dir = '/home/nadeem/sjsu/data/nuScenes/'
+
+    # sample data file
+    # train
+    metadata_subdir='v1.0-train'
+    # validation
+    metadata_subdir='v1.0-val'
+    # mini
+    metadata_subdir='v1.0-mini'
+
+    import DeepDataMiningLearning.detection.transforms as T
+    def get_transformsimple():
+        transforms = []
+        transforms.append(T.PILToTensor())
+        transforms.append(T.ToDtype(torch.float, scale=True))
+        return T.Compose(transforms)
+
+    ds = NuscenesDataset(data_dir=data_dir, metadata_subdir=metadata_subdir, train=True, transform=get_transformsimple())
+    print("Size of dataset", len(ds))
+
+    test_idx = random.randint(0, len(ds) - 1)
+    img, target = ds[test_idx]
+
+    print(img.size) 
+    print(target.keys()) #['boxes', 'labels', 'image_id', 'area', 'iscrowd']
+    boxes = target['boxes']
+    labels = target['labels']
+    print(boxes.shape)  #torch.Size([3, 4]) n,4
+    print(labels)
+    labels = [ds.INSTANCE_CATEGORY_NAMES[int(label)] for label in labels]
+    print(labels)
+
+    # Draw bounding box
+    import torchvision
+    img = torchvision.utils.draw_bounding_boxes(img, boxes, labels, width=2, colors="yellow",  fill=False) 
+    
+    img = torchvision.transforms.ToPILImage()(img) 
+
+    # save output 
+    img.save(os.path.join(data_dir, "out.png")) 
diff --git a/DeepDataMiningLearning/detection/mytrain.py b/DeepDataMiningLearning/detection/mytrain.py
index af7d843..257dd07 100644
--- a/DeepDataMiningLearning/detection/mytrain.py
+++ b/DeepDataMiningLearning/detection/mytrain.py
@@ -222,7 +222,7 @@ def main(args):
         if args.rpn_score_thresh is not None:
             kwargs["rpn_score_thresh"] = args.rpn_score_thresh
     
-    model, preprocess, classes = create_detectionmodel(args.model, num_classes, args.trainable)
+    model, preprocess, classes = create_detectionmodel(args.model, num_classes=num_classes, trainable_layers=args.trainable, device=device)
     model.to(device)
     
     if args.distributed and args.sync_bn:
@@ -330,7 +330,7 @@ def train_one_epoch(model, optimizer, data_loader, device, epoch, print_freq, sc
         images = list(image.to(device) for image in images) #list of [3, 1280, 1920]
         targets = [{k: v.to(device) if isinstance(v, torch.Tensor) else v for k, v in t.items()} for t in targets] #tuple to list
         #with torch.cuda.amp.autocast(enabled=scaler is not None):
-        with torch.amp.autocast(enabled=scaler is not None):
+        with torch.amp.autocast(device_type=device.type, enabled=scaler is not None):
             loss_dict = model(images, targets)
             losses = sum(loss for loss in loss_dict.values()) #single value