fix dependency install instructions for examples

examples/computer_vision/iptc_exif_xmp_lib.py

@@ -1,4 +1,10 @@
-# pip install defusedxml
+"""
+To install the required dependencies:
+
+  pip install datachain[examples]
+
+"""
+
 import json
 
 from PIL import (

examples/computer_vision/llava2_image_desc_lib.py

@@ -1,4 +1,10 @@
-# pip install accelerate torch
+"""
+To install the required dependencies:
+
+  pip install datachain[examples]
+
+"""
+
 import torch
 from transformers import (
     AutoProcessor,

examples/get_started/json-csv-reader.py

@@ -1,5 +1,3 @@
-# pip install datamodel-code-generator jmespath
-
 from typing import Optional
 
 from pydantic import BaseModel

examples/get_started/torch-loader.py

@@ -1,4 +1,9 @@
-# pip install Pillow torchvision
+"""
+To install the required dependencies:
+
+  pip install datachain[torch]
+
+"""
 
 import os
 from posixpath import basename

examples/get_started/udfs/stateful.py

@@ -1,7 +1,7 @@
 """
-To install dependencies:
+To install the required dependencies:
 
-  pip install open_clip_torch
+  pip install datachain[examples]
 
 """