diff --git a/README.md b/README.md
index 29bc8d7..0de0508 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,8 @@
 <!-- ![avengers]() -->
 
 ## :rocket: Updates
+- 2023/04/25:  We are delighted to introduce [Caption-Anything](https://github.com/ttengwang/Caption-Anything) :writing_hand:, a versatile image processing tool that combines the capabilities of Segment Anything, Visual Captioning, and ChatGPT. 
+
 - 2023/04/20: We deployed [[DEMO]](https://huggingface.co/spaces/watchtowerss/Track-Anything) on Hugging Face :hugs:! 
 
 ## Demo
@@ -56,13 +58,6 @@ cd Track-Anything
 # Install dependencies: 
 pip install -r requirements.txt
 
-# Install dependencies for inpainting: 
-pip install -U openmim
-mim install mmcv
-
-# Install dependencies for editing
-pip install madgrad 
-
 # Run the Track-Anything gradio demo.
 python app.py --device cuda:0 --sam_model_type vit_h --port 12212
 ```
diff --git a/requirements.txt b/requirements.txt
index 681f309..0a8961b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,3 +15,5 @@ onnx
 metaseg==0.6.1
 pyyaml
 av
+mmcv-full
+mmengine
diff --git a/tracker/base_tracker.py b/tracker/base_tracker.py
index 1b2e8fe..68f2a42 100644
--- a/tracker/base_tracker.py
+++ b/tracker/base_tracker.py
@@ -9,14 +9,14 @@ import yaml
 import torch.nn.functional as F
 from model.network import XMem
 from inference.inference_core import InferenceCore
-from util.mask_mapper import MaskMapper
+from tracker.util.mask_mapper import MaskMapper
 from torchvision import transforms
-from util.range_transform import im_normalization
-import sys
-sys.path.insert(0, sys.path[0]+"/../")
+from tracker.util.range_transform import im_normalization
+
 from tools.painter import mask_painter
 from tools.base_segmenter import BaseSegmenter
 from torchvision.transforms import Resize
+import progressbar
 
 
 class BaseTracker:
@@ -101,6 +101,8 @@ class BaseTracker:
                 continue
             painted_image = mask_painter(painted_image, (final_mask==obj).astype('uint8'), mask_color=obj+1)
 
+        print(f'max memory allocated: {torch.cuda.max_memory_allocated()/(2**20)} MB')
+
         return final_mask, final_mask, painted_image
 
     @torch.no_grad()
@@ -126,50 +128,65 @@ class BaseTracker:
         self.mapper.clear_labels()
 
 
+##  how to use:
+##  1/3) prepare device and xmem_checkpoint
+#   device = 'cuda:2'
+#   XMEM_checkpoint = '/ssd1/gaomingqi/checkpoints/XMem-s012.pth'
+##  2/3) initialise Base Tracker
+#   tracker = BaseTracker(XMEM_checkpoint, device, None, device)    # leave an interface for sam model (currently set None)
+##  3/3) 
+
+
 if __name__ == '__main__':
-    # video frames (multiple objects)
+    # video frames (take videos from DAVIS-2017 as examples)
     video_path_list = glob.glob(os.path.join('/ssd1/gaomingqi/datasets/davis/JPEGImages/480p/horsejump-high', '*.jpg'))
     video_path_list.sort()
-    # first frame
-    first_frame_path = '/ssd1/gaomingqi/datasets/davis/Annotations/480p/horsejump-high/00000.png'
     # load frames
     frames = []
     for video_path in video_path_list:
         frames.append(np.array(Image.open(video_path).convert('RGB')))
-    frames = np.stack(frames, 0)    # N, H, W, C
+    frames = np.stack(frames, 0)    # T, H, W, C
     # load first frame annotation
+    first_frame_path = '/ssd1/gaomingqi/datasets/davis/Annotations/480p/horsejump-high/00000.png'
     first_frame_annotation = np.array(Image.open(first_frame_path).convert('P'))    # H, W, C
 
-    # ----------------------------------------------------------
-    # initalise tracker
-    # ----------------------------------------------------------
-    device = 'cuda:4'
+    # ------------------------------------------------------------------------------------
+    # how to use
+    # ------------------------------------------------------------------------------------
+    # 1/4: set checkpoint and device
+    device = 'cuda:2'
     XMEM_checkpoint = '/ssd1/gaomingqi/checkpoints/XMem-s012.pth'
-    SAM_checkpoint= '/ssd1/gaomingqi/checkpoints/sam_vit_h_4b8939.pth'
-    model_type = 'vit_h'
-
-    # sam_model = BaseSegmenter(SAM_checkpoint, model_type, device=device)
+    # SAM_checkpoint= '/ssd1/gaomingqi/checkpoints/sam_vit_h_4b8939.pth'
+    # model_type = 'vit_h'
+    # ------------------------------------------------------------------------------------
+    # 2/4: initialise inpainter
     tracker = BaseTracker(XMEM_checkpoint, device, None, device)
-
-    # # test for storage efficiency
-    # frames = np.load('/ssd1/gaomingqi/efficiency/efficiency.npy')
-    # first_frame_annotation = np.array(Image.open('/ssd1/gaomingqi/efficiency/template_mask.png'))
-
-    first_frame_annotation[first_frame_annotation==1] = 15
-    first_frame_annotation[first_frame_annotation==2] = 20
-
-    save_path = '/ssd1/gaomingqi/results/TrackA/multi-change1'
-    if not os.path.exists(save_path):
-        os.mkdir(save_path)
-
+    # ------------------------------------------------------------------------------------
+    # 3/4: for each frame, get tracking results by tracker.track(frame, first_frame_annotation)
+    # frame: numpy array (H, W, C), first_frame_annotation: numpy array (H, W), leave it blank when tracking begins
+    painted_frames = []
     for ti, frame in enumerate(frames):
         if ti == 0:
-            mask, prob, painted_image = tracker.track(frame, first_frame_annotation)
+            mask, prob, painted_frame = tracker.track(frame, first_frame_annotation)
+            # mask: 
         else:
-            mask, prob, painted_image = tracker.track(frame)
-        # save
-        painted_image = Image.fromarray(painted_image)
-        painted_image.save(f'{save_path}/{ti:05d}.png')
+            mask, prob, painted_frame = tracker.track(frame)
+        painted_frames.append(painted_frame)
+    # ----------------------------------------------
+    # 3/4: clear memory in XMEM for the next video
+    tracker.clear_memory()
+    # ----------------------------------------------
+    # end
+    # ----------------------------------------------
+    print(f'max memory allocated: {torch.cuda.max_memory_allocated()/(2**20)} MB')
+    # set saving path
+    save_path = '/ssd1/gaomingqi/results/TAM/blackswan'
+    if not os.path.exists(save_path):
+        os.mkdir(save_path)
+    # save
+    for painted_frame in progressbar.progressbar(painted_frames):
+        painted_frame = Image.fromarray(painted_frame)
+        painted_frame.save(f'{save_path}/{ti:05d}.png')
 
     # tracker.clear_memory()
     # for ti, frame in enumerate(frames):
@@ -241,6 +258,3 @@ if __name__ == '__main__':
     #     prob = Image.fromarray((probs[1].cpu().numpy()*255).astype('uint8'))
 
     #     # prob.save(f'/ssd1/gaomingqi/failure/probs/{ti:05d}.png')
-
-
-
diff --git a/tracker/inference/inference_core.py b/tracker/inference/inference_core.py
index 7e30a91..e77f080 100644
--- a/tracker/inference/inference_core.py
+++ b/tracker/inference/inference_core.py
@@ -2,7 +2,7 @@ from inference.memory_manager import MemoryManager
 from model.network import XMem
 from model.aggregate import aggregate
 
-from util.tensor_util import pad_divide_by, unpad
+from tracker.util.tensor_util import pad_divide_by, unpad
 
 
 class InferenceCore: