class_docstr: Square root without dividing by 0.
class_docstr_tok: ["Square","root","without","dividing","by","0","."]
code: def backward(ctx, grad_output):
      _, o = ctx.saved_tensors
      grad_input = grad_output.clone()
      grad_input *= 0.5 / (o + constants.EPSILON)
      return grad_input
  
imports: import time
  import numpy
  import scipy.special
  import torch
  import torch.nn
  from .None import constants
  from .None import syssettings
  from .fginitialize import ChunkDataLoader
label_desc: Use image node_id 2 for calling the safesqrt obj's underlying member method code with example usage: obj.backward(ctx, grad_output) and returns: grad_input