code: def gaussian(x, mean, std):
      """compute gaussian basis kernel function"""
      const_pi = 3.14159
      a = (2 * const_pi) ** 0.5
      return th.exp(-0.5 * (((x - mean) / std) ** 2)) / (a * std)
  
file_path: dgl/python/dgl/nn/pytorch/gt/spatial_encoder.py
imports: import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 1 for calling a global function with example usage: gaussian(x, mean, std) and returns: unknown