class_docstr: Im2Col function.
code: def check_type_forward(self, in_types):
      type_check._argname(in_types, ("x",))
  
      x_type = in_types[0]
      type_check.expect(x_type.dtype.kind == "f", x_type.ndim == 4)
  
imports: import numpy
  from chainer import function_node
  from chainer.utils.conv import col2im_cpu
  from chainer.utils.conv import col2im_gpu
  from chainer.utils.conv import im2col_cpu
  from chainer.utils.conv import im2col_gpu
  from chainer.utils import type_check
label_desc: Use image node_id 2 for calling the Im2Col obj's underlying member method code with example usage: obj.check_type_forward(in_types) without return types