code: def test_conv2d_is_half(self):
      m = nn.Conv2d(self.c, self.c, self.k)
      f = ft.partial(F.conv2d, weight=m.weight, bias=m.bias)
      run_layer_test(
          self, [m, f], ALWAYS_HALF, (self.b, self.c, self.h, self.h)
      )
  
imports: import unittest
  import functools
  import itertools
  from apex import amp
  import torch
  from torch import nn
  import torch.nn.functional
  from utils import common_init, HALF, FLOAT, ALWAYS_HALF, ALWAYS_FLOAT, MATCH_INPUT
label_desc: Use image node_id 4 for calling the TestBasicCasts obj's underlying member method code with example usage: obj.test_conv2d_is_half() without return types