code: def _mish_python(x):
      """
      See Mish: A Self-Regularized Non-Monotonic Activation Function (Misra., https://arxiv.org/abs/1908.08681). Also
      visit the official repository for the paper: https://github.com/digantamisra98/Mish
      """
      return x * torch.tanh(nn.functional.softplus(x))
  
file_path: fastNLP/fastNLP/transformers/torch/activations.py
imports: import math
  from packaging import version
  from fastNLP.envs.imports import _NEED_IMPORT_TORCH
  from fastNLP.core.log import logger
label_desc: Use image node_id 6 for calling a global function with example usage: _mish_python(x) and returns: unknown