[GitHub] [incubator-mxnet] hgt312 commented on a change in pull request #15388: Doc

[GitBox <gi...@apache.org>]

hgt312 commented on a change in pull request #15388: Doc
URL: https://github.com/apache/incubator-mxnet/pull/15388#discussion_r298919976
 
 

 ##########
 File path: python/mxnet/symbol/numpy/_symbol.py
 ##########
 @@ -1407,8 +1419,111 @@ def _unary_func_helper(x, fn_array, fn_scalar, out=None, **kwargs):
     else:
         raise TypeError('type {} not supported'.format(str(type(x))))
 
+@set_module('mxnet.symbol.numpy')
+def trunc(x, out=None, **kwargs):
+    r"""
+    trunc(x, out=None)
+
+    Return the truncated value of the input, element-wise.
+
+    The truncated value of the scalar `x` is the nearest integer `i` which
+    is closer to zero than `x` is. In short, the fractional part of the
+    signed number `x` is discarded.
+    
+    Parameters
+    ----------
+    x : _Symbol or scalar
+        Input data.
+    out : _Symbol or None, optional
+        A location into which the result is stored. 
+    
+    Returns
+    -------
+    y : _Symbol or scalar
+        The truncated value of each element in `x`.
+        This is a scalar if `x` is a scalar.
+
+    Notes
+    -----
+    This function differs from the original numpy.trunc in the following aspects:
+        - Do not support `where`, a parameter in numpy which indicates where to calculate. 
+        - Cannot cast type automatically. Dtype of `out` must be same as the expected one.
+        - Cannot broadcast automatically. Shape of `out` must be same as the expected one.
+        - If `x` is plain python numeric, the result won't be stored in out.
+    """    
+    return _unary_func_helper(x, _npi.trunc, _np.trunc, out=out, **kwargs)
 
 @set_module('mxnet.symbol.numpy')
+def logical_not(x, out=None, **kwargs):
+    r"""
+    logical_not(x, out=None)
+
+    Compute the truth value of NOT x element-wise.
+
+    Parameters
+    ----------
+    x : _Symbol or scalar
+        Logical NOT is applied to the elements of `x`.
+    out : _Symbol or None, optional
 
 Review comment:
   `out` is a dummy parameter, the symbol will not be stored in it.

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