code: def assign(self, size):
      if size > self.size:
          self.size = size
          self.memory = cp.cuda.alloc_pinned_memory(size)
  
imports: import ctypes
  import mpi4py.MPI
  import numpy
  from chainermn.communicators import _communication_utility
  import chainer.backends
  import chainerx
label_desc: Use image node_id 2 for calling the HostPinnedMemory obj's underlying member method code with example usage: obj.assign(size) without return types