code: def test_identity_before_concatenate_no_removal():
      """Check that an identity isn't removed when the operator
      following it is a concatenate operation."""
  
      def get_graph():
          x = relay.var("x", shape=(1, 1, 4, 4), dtype="int8")
          y = relay.var("y", shape=(1, 2, 2, 4), dtype="int8")
          z = relay.var("z", shape=(1, 2, 2, 4), dtype="int8")
          x = relay.reshape(x, newshape=(1, 2, 2, 4))
          y = relay.strided_slice(
              y, begin=(0, 0, 0, 0), end=(1, 2, 2, 4)
          )
          x = infra.make_ethosu_identity(x)
          y = infra.make_ethosu_identity(y)
          out = relay.concatenate([x, y, z], axis=0)
          return relay.Function(relay.analysis.free_vars(out), out)
  
      actual = _optimize(get_graph())
      expected = _optimize(get_graph(), optimize=False)
      _assert_structural_equal(actual, expected)
  
imports: import pytest
  import tensorflow
  import tvm
  from tvm import relay
  from tvm.relay.op.contrib.ethosu import partition_for_ethosu
  from tvm.relay.backend.contrib.ethosu.codegen import relay_to_tir
  from tvm.relay.backend.contrib.ethosu.codegen import IdentityOptimizer
  from .None import infra
label_desc: Use image node_id 11 for calling a global function with example usage: test_identity_before_concatenate_no_removal() and returns: relay