code: def __call__(self, x):
      return self.W @ x + self.b
  
file_path: tensor-sensor/testing/viz_testing.py
imports: import sys
  import torch
  import numpy
  import graphviz
  import tempfile
  import matplotlib.patches
  import matplotlib.pyplot
  import matplotlib.font_manager
  import tsensor
  import torch
  import tsensor
label_desc: Use image node_id 2 for calling the Linear obj's underlying member method code with example usage: obj.__call__(x) and returns: unknown