class_docstr: Layer constructor function for a general convolution layer.
code: def _check_nhwc(self):
      msg = "Convolutions on more than 4 dimensions only supported in NHWC."
      assert self._lhs_spec == self._out_spec == "NHWC", msg
  
imports: import functools
  import itertools
  import operator
  from trax import fastmath
  from trax.fastmath import numpy
  from trax.layers import base
  from trax.layers import initializers
label_desc: Use image node_id 2 for calling the Conv obj's underlying member method code with example usage: obj._check_nhwc() without return types