text: import numpy as np
  import tvm
  import topi
  from topi import util
  
  
  def test_util():
      x = tvm.const(100)
      assert util.get_const_int(x) == 100
      assert util.get_const_tuple((x, x)) == (100, 100)
  
  
  def test_ewise():
      m = tvm.var('m')
      l = tvm.var('l')
      A = tvm.placeholder((m, l), name='A')
  
      shape = (20, 3)
  
      def test_apply(func, name, f_numpy):
          B = func(A)
          assert tuple(B.shape) == tuple(A.shape)
          assert B.op.body[0].name == name
          a_np = np.random.uniform(low=1e-5, size=shape).astype(A.dtype)
          a_np = np.abs(a_np)
          b_np = f_numpy(a_np)
  
          def check_device(device):
              ctx = tvm.context(device, 0)
              if not ctx.exist:
                  print("Skip because %s is not enabled" % device)
                  return
              print("Running on target: %s" % device)
              with tvm.target.create(device):
                  s = topi.generic.schedule_injective(B)
              a = tvm.nd.array(a_np, ctx)
              b = tvm.nd.array(np.zeros_like(b_np), ctx)
              foo = tvm.build(s, [A, B], device, name=name)
              foo(a, b)
              np.testing.assert_allclose(b.asnumpy(), b_np, rtol=1e-5, atol=1e-5)
  
          for device in ['cuda', 'opencl', 'metal', 'rocm', 'vulkan', 'llvm']:
              check_device(device)
  
      test_apply(topi.exp, "exp", np.exp)
      test_apply(topi.tanh, "tanh", np.tanh)
      test_apply(topi.sigmoid, "sigmoid", lambda x:1/(1+np.exp(-x)))
      test_apply(topi.log, "log", np.log)
      test_apply(topi.sqrt, "sqrt", np.sqrt)
  
  if __name__ == "__main__":
      test_util()
      test_ewise()
  