add remove_bg function

example_modules/demo_modules/rembg.module.py

@@ -0,0 +1,41 @@
+import io
+import base64
+from typing import List
+
+from jarvis.functional_modules.caller_context import CallerContext
+from jarvis.functional_modules.functional_module import functional_module
+from jarvis.logger import logger
+
+
+def reg_or_not():
+    try:
+        from rembg import new_session, remove
+        from PIL import Image
+    except ImportError as e:
+        logger.warn(f"rembg or PIL not installed, remove_bg will not be available")
+        return
+
+    session = new_session(model_name="u2net")
+
+    @functional_module(
+        name="remove_bg",
+        description="Remove the background of last image",
+        signature={})
+    async def remove_bg(context: CallerContext):
+        img_base64 = context.get_last_image()
+        if img_base64 is None:
+            await context.reply_text("You need to give me an image first")
+            return "Failed"
+        bytes_io = io.BytesIO(base64.b64decode(img_base64))
+        img = Image.open(bytes_io)
+        output = remove(img, session=session)
+        output_bytesio = io.BytesIO()
+        output.save(output_bytesio, 'PNG')
+        output_bytes = output_bytesio.getvalue()
+        result = base64.b64encode(output_bytes).decode()
+        
+        context.set_last_image(result)
+        await context.reply_image_base64(result)
+        return "Success"
+
+reg_or_not()