[GitHub] [incubator-mxnet] hgt312 commented on a change in pull request #15382: [numpy][doc-fix] sum, copy, tile, argmax, sign, log, degrees

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hgt312 commented on a change in pull request #15382: [numpy][doc-fix] sum, copy, tile, argmax, sign, log, degrees
URL: https://github.com/apache/incubator-mxnet/pull/15382#discussion_r298873978
 
 

 ##########
 File path: python/mxnet/symbol/numpy/_symbol.py
 ##########
 @@ -1561,6 +1573,44 @@ def sqrt(x, out=None, **kwargs):
     return _unary_func_helper(x, _npi.sqrt, _np.sqrt, out=out, **kwargs)
 
 
+@set_module('mxnet.symbol.numpy')
+def sign(x, out=None, **kwargs):
+    r"""
+    Returns an element-wise indication of the sign of a number.
+
+    The `sign` function returns ``-1 if x < 0, 0 if x==0, 1 if x > 0``. Only supports real number.
+
+    Parameters
+    ----------
+    x : _Symbol or a scalar
+        Input values.
+    out : _Symbol or None, optional
 
 Review comment:
   Use this for unary ops.
   ```
   out : _Symbol or None
           Dummy parameter to keep the consistency with the ndarray counterpart.
   ```

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