piiswrong commented on a change in pull request #10931: [MXNET-349] Histogram
Operator
URL: https://github.com/apache/incubator-mxnet/pull/10931#discussion_r192571164
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File path: python/mxnet/ndarray/ndarray.py
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@@ -3740,3 +3740,36 @@ def empty(shape, ctx=None, dtype=None):
if dtype is None:
dtype = mx_real_t
return NDArray(handle=_new_alloc_handle(shape, ctx, False, dtype))
+
+
+# pylint: disable= redefined-builtin
+def histogram(a, bins=10, range=None):
+ """Compute the histogram of the input data.
+
+ Parameters
+ ----------
+ a : NDArray
+ Input data. The histogram is computed over the flattened array.
+ bins : int or sequence of scalars
+ If bins is an int, it defines the number of equal-width bins in the
+ given range (10, by default). If bins is a sequence, it defines the
bin edges,
+ including the rightmost edge, allowing for non-uniform bin widths.
+ range_ : (float, float), optional
+ The lower and upper range of the bins. If not provided, range is
simply (a.min(), a.max()).
+ Values outside the range are ignored. The first element of the range
must be less than or
+ equal to the second. range affects the automatic bin computation as
well, the range will
+ be equally divided by the number of bins.
+ """
+
+ # pylint: disable= no-member, protected-access
+ if isinstance(bins, NDArray):
+ return _internal._histogram(data=a, bins=bins)
+ elif isinstance(bins, integer_types):
+ if range is None:
+ warnings.warn("range_ is not specified, using numpy's result "
+ "to ensure consistency with numpy")
+ res, bin_bounds = np.histogram(a.asnumpy(), bins=bins)
+ return array(res), array(bin_bounds)
+ return _internal._histogram(data=a, bin_cnt=bins, range=range)
+ return None
Review comment:
why return None? Shouldn't this cause an error?
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