[GitHub] anirudhacharya commented on a change in pull request #12967: [MXNET-1173] Debug operators - isfinite and isinf

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anirudhacharya commented on a change in pull request #12967: [MXNET-1173] Debug operators - isfinite and isinf
URL: https://github.com/apache/incubator-mxnet/pull/12967#discussion_r227978989
 
 

 ##########
 File path: python/mxnet/ndarray/contrib.py
 ##########
 @@ -460,3 +461,65 @@ def _to_python_scalar(inputs, type_, name):
         return then_func()
     else:
         return else_func()
+
+def isinf(data, ctx=None):
+    """Checks whether a given NDArray has infinity or not
+
+
+    Parameters
+    ----------
+    input : NDArray
+        An N-D NDArray.
+    ctx : Context
+        Device context of output. Default is current context.
+
+    Returns
+    -------
+    output: NDArray
+        The output NDarray with 1 and 0 indicating whether infinite or not.
+
+    Examples
+    --------
+    >>> data = mx.nd.array([np.inf, -np.inf, np.NINF, -1])
+    >>> output = mx.nd.contrib.isinf(data)
+    >>> output
+    [1. 1. 1. 0.]
+    <NDArray 4 @cpu(0)>
+    """
+    if ctx is None:
+        ctx = current_context()
+    # any(x in data for x in [np.inf, -np.inf])
+    # abs(data) == np.inf > TypeError: bad operand type for abs(): 'NDArray'
+    # [abs(x) == np.inf for x in data] > TypeError: bad operand type for abs(): 'NDArray'
+    return ndarray.NDArray.abs(data) == np.inf
+
+def isfinite(data, ctx=None):
+    """Checks whether a given NDArray has finit value or not
 
 Review comment:
   same comments as above.

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