code: def test_bias(self):
      Tensor.no_grad = True
      from tinygrad.nn import Conv2d
  
      x = Tensor.rand(1, 12, 128, 256)
      c = Conv2d(12, 32, 3)
      x = c(x).relu()
      w = Tensor.uniform(32, 1, 3, 3)
      x = x.conv2d(w, groups=32)
      x.numpy()
      Tensor.no_grad = False
  
file_path: tinygrad/test/test_conv.py
imports: import unittest
  import numpy
  from tinygrad.tensor import Tensor, Device
label_desc: Use image node_id 12 for calling the TestConv obj's underlying member method code with example usage: obj.test_bias() without return types