code: def as_tuple(x, n):
      if hasattr(x, "__getitem__"):
          assert len(x) == n
          return tuple(x)
      return (x,) * n
  
file_path: chainer/chainer/utils/conv_nd.py
imports: import itertools
  import numpy
  import six
  from chainer.backends import cuda
  from chainer.utils.conv import get_conv_outsize
  from chainer.utils import conv_nd_kernel
label_desc: Use image node_id 1 for calling a global function with example usage: as_tuple(x, n) and returns: unknown, tuple