[GitHub] [incubator-mxnet] haojin2 commented on a change in pull request #15461: Numpy logspace

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

haojin2 commented on a change in pull request #15461: Numpy logspace
URL: https://github.com/apache/incubator-mxnet/pull/15461#discussion_r302818876
 
 

 ##########
 File path: python/mxnet/ndarray/numpy/_op.py
 ##########
 @@ -1691,3 +1692,101 @@ def arcsin(x, out=None, **kwargs):
     http://www.math.sfu.ca/~cbm/aands/
     """
     return _unary_func_helper(x, _npi.arcsin, _np.arcsin, out=out, **kwargs)
+
+
+@set_module('mxnet.ndarray.numpy')
+def logspace(start, stop, num=50, endpoint=True, base=10.0, dtype=None, axis=0, ctx=None):  # pylint: disable=too-many-arguments
+    r"""Return numbers spaced evenly on a log scale.
+
+    In linear space, the sequence starts at ``base ** start``
+    (`base` to the power of `start`) and ends with ``base ** stop``
+    (see `endpoint` below).
+
+        Non-scalar `start` and `stop` are now supported.
+
+    Parameters
+    ----------
+    start : int or float
+        ``base ** start`` is the starting value of the sequence.
+    stop : int or float
+        ``base ** stop`` is the final value of the sequence, unless `endpoint`
+        is False.  In that case, ``num + 1`` values are spaced over the
+        interval in log-space, of which all but the last (a sequence of
+        length `num`) are returned.
+    num : integer, optional
+        Number of samples to generate.  Default is 50.
+    endpoint : boolean, optional
+        If true, `stop` is the last sample. Otherwise, it is not included.
+        Default is True.
+    base : float, optional
+        The base of the log space. The step size between the elements in
+        ``ln(samples) / ln(base)`` (or ``log_base(samples)``) is uniform.
+        Default is 10.0.
+    dtype : dtype
+        The type of the output array.  If `dtype` is not given, infer the data
+        type from the other input arguments.
+    axis : int, optional
+        The axis in the result to store the samples.  Relevant only if start
+        or stop are array-like.  By default (0), the samples will be along a
+        new axis inserted at the beginning. Now, axis only support axis = 0.
+    ctx : Context, optional
+        An optional device context (default is the current default context).
+
+    Returns
+    -------
+    samples : ndarray
+        `num` samples, equally spaced on a log scale.
+
+    See Also
+    --------
+    arange : Similar to linspace, with the step size specified instead of the
+             number of samples. Note that, when used with a float endpoint, the
+             endpoint may or may not be included.
+    linspace : Similar to logspace, but with the samples uniformly distributed
+               in linear space, instead of log space.
+
+    Notes
+    -----
+    Logspace is equivalent to the code. Now wo only support axis = 0.
+
+    >>> y = np.linspace(start, stop, num=num, endpoint=endpoint)
+    ... # doctest: +SKIP
 
 Review comment:
   what's this?

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services