code: def mse_loss(x, y):
      return torch.mean((x - y) ** 2)
  
file_path: pytorch/functorch/examples/maml_regression/evjang_transforms_module.py
imports: import math
  import matplotlib
  import matplotlib.pyplot
  import numpy
  import torch
  from functorch import grad, make_functional, vmap
  from torch import nn
  from torch.nn import functional
label_desc: Use image node_id 1 for calling a global function with example usage: mse_loss(x, y) and returns: torch