ChaiBapchya 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_r227996456
##########
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
+
+
+ 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 finite or not.
+
+ Examples
+ --------
+ >>> data = mx.nd.array([np.inf, -np.inf, np.NINF, -1])
+ >>> output = mx.nd.contrib.isfinite(data)
+ >>> output
+ [0. 0. 0. 1.]
+ <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
Review comment:
It returns 0 for NaN even now.
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