[GitHub] [incubator-mxnet] tingying2020 commented on a change in pull request #15387: Add docs for 7 ops

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tingying2020 commented on a change in pull request #15387: Add docs for 7 ops
URL: https://github.com/apache/incubator-mxnet/pull/15387#discussion_r298917957
 
 

 ##########
 File path: python/mxnet/ndarray/numpy/_op.py
 ##########
 @@ -882,3 +902,123 @@ def sqrt(x, out=None, **kwargs):
     This function only supports input type of float.
     """
     return _unary_func_helper(x, _npi.sqrt, _np.sqrt, out=out, **kwargs)
+
+@set_module('mxnet.ndarray.numpy')
+def arctanh(x, out=None, where=True, **kwargs):
+    r"""
+    arctanh(x, out=None, where=True, **kwargs)
+
+    Inverse hyperbolic tangent element-wise.
+
+    Parameters:	
+
+    -----------
+    x : ndarray 
+        Input array.
+    out : ndarray, None, or tuple of ndarray and None.
+          A location into which the result is stored. If provided, 
+          it must have a shape that the inputs broadcast to. 
+          If not provided or None, a freshly-allocated array is returned. 
+          A tuple (possible only as a keyword argument) 
+          must have length equal to the number of outputs.
+    where : ndarray, optional
 
 Review comment:
   where can be tuple. But when you provide `where`, it doesn't work. 

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