code: def backprop_relu(self, dY, Y, inplace=False):
      if not inplace:
          return dY * (Y > 0)
      dY *= Y > 0
      return dY
  
imports: import numpy
  from ..None import registry
  from ..compat import cupy, cupyx
  from ..types import DeviceTypes
  from ..util import is_cupy_array, is_mxnet_gpu_array, is_tensorflow_gpu_array, is_torch_cuda_array, mxnet2xp, tensorflow2xp, torch2xp
  from .None import _custom_kernels
  from .numpy_ops import NumpyOps
  from .ops import Ops
label_desc: Use image node_id 14 for calling the CupyOps obj's underlying member method code with example usage: obj.backprop_relu(dY, Y, inplace) and returns: dY, unknown