code: def forward(self, x):
      # Simple forward function: sign_ste(w*x)*w
      out = self.w.data(x.device) * x
      out = mx.npx.sign_ste(out)
      # Uncomment to see how test fails with sign
      # out = F.sign(out)
      out = out * self.w.data(x.device)
      return out
  
file_path: mxnet/tests/python/unittest/test_contrib_stes_op.py
imports: from common import xfail_when_nonstandard_decimal_separator
  import mxnet
  from mxnet import nd, autograd, gluon
  from mxnet.test_utils import default_device
label_desc: Use image node_id 4 for calling the SignSTENET obj's underlying member method code with example usage: obj.forward(x) and returns: out