code: def remove_empty_pad(mod):
      """Remove the empty pad operator."""
      mod["main"] = rewrite(remove_empty_pad_callback(), mod["main"])
      return mod
  
imports: import functools
  import numpy
  import tvm
  from tvm import relay
  from tvm.relay.dataflow_pattern import DFPatternCallback, is_constant, is_op, is_tuple, rewrite, wildcard
  from tvm.topi.utils import get_const_tuple
  from tvm.relay.expr import Call
  from tvm.runtime import ndarray
  from ..._ffi.registry import register_func
label_desc: Use image node_id 6 for calling a global function with example usage: remove_empty_pad(mod) and returns: mod