piiswrong commented on a change in pull request #10931: [MXNET-349] [WIP] 
Histogram Operator
URL: https://github.com/apache/incubator-mxnet/pull/10931#discussion_r188034390
 
 

 ##########
 File path: python/mxnet/ndarray/ndarray.py
 ##########
 @@ -3740,3 +3740,29 @@ 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))
+
+
+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.
+    """
+
+    if isinstance(bins, NDArray):
+        return _internal._histogram(data=a, bins=bins)
+    elif isinstance(bins, int):
+        if range_ is None:
+            range_ = (float(a.min().asnumpy()[0]), float(a.max().asnumpy()[0]))
+        return _internal._histogram(data=a, bins=array([]), bin_cnt=bins, 
range=range_)
 
 Review comment:
   why make an invalid array/

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