code: def forward(ctx, input):
      ctx.save_for_backward(input)
      return input.clamp(min=0)
  
file_path: pytext/pytext/utils/loss.py
imports: import numpy
  import torch
  from .cuda import FloatTensor
label_desc: Use image node_id 1 for calling the LagrangeMultiplier obj's underlying member method code with example usage: obj.forward(ctx, input) and returns: input