handler.py

from typing import Dict, List, Any
import os
import requests
from flask import Flask, Response, request, jsonify
from segment_anything import SamPredictor, sam_model_registry

class EndpointHandler():
	def __init__(self, path=""):
		# Preload all the elements you are going to need at inference.
		model_type = "vit_b"
		# prefix = "/opt/ml/model"
		print('current working directory', os.getcwd())
		model_path = "models/tf_model.h5"
		# model_checkpoint_path = os.path.join(prefix, "sam_vit_h_4b8939.pth")
		sam = sam_model_registry[model_type](checkpoint=model_path)
		self.predictor = SamPredictor(sam)
	
	def __call__(self, data: Dict[str, Any]) -> List[Dict[str, Any]]:
		"""
		data args:
			inputs (:obj: `str` | `PIL.Image` | `np.array`)
			kwargs
		Return:
			A :obj:`list` | `dict`: will be serialized and returned
		"""
		
		inputs = data.pop("inputs", data)
		image_url = inputs.pop("imageUrl", None)
		
		if not image_url:
			return jsonify({"error": "image_url not provided"}), 400
			
		try:
			response = requests.get(image_url)
			response.raise_for_status()
			image = response.content
		except requests.RequestException as e:
			return jsonify({"error": f"Error downloading image: {str(e)}"}), 500
			
		self.predictor.set_image(image)
		
		image_embedding = self.predictor.get_image_embedding().cpu().numpy().tolist()
		
		return jsonify(image_embedding)