class_docstr: TestElementWise
code: def expected_output_np(self, input_np):
      return 2 * input_np
  
imports: import contextlib
  import numpy
  import pytest
  import tvm
  import tvm.contrib.hexagon
  import tvm.testing
  from tvm import te
  from tvm.contrib.hexagon.pytest_plugin import requires_hexagon_toolchain
  from tvm.tir.stmt_functor import post_order_visit
  from tvm.contrib.hexagon import allocate_hexagon_array
  from .infrastructure import get_hexagon_target
label_desc: Use image node_id 1 for calling the TestElementWise obj's underlying member method code with example usage: obj.expected_output_np(input_np) and returns: unknown