code: def dummy_model(x):
      return np.random.randn(1)
  
file_path: chitra/tests/serve/test_app.py
imports: import unittest.mock
  from unittest.mock import MagicMock
  import numpy
  import pytest
  from chitra.serve import GradioApp
  from chitra.serve import constants
label_desc: Use image node_id 1 for calling a global function with example usage: dummy_model(x) and returns: np