Wrong results of min([inf, inf]) and max([-inf,-inf])

[wkcn]

Description

Hi, there. The user Orb! found the bug.
The results of min([inf, inf]) and max([-inf,-inf]) are wrong.

Environment info (Required)

----------Python Info----------
Version      : 3.7.4
Compiler     : GCC 9.1.0
Build        : ('default', 'Jul 16 2019 07:12:58')
Arch         : ('64bit', 'ELF')
------------Pip Info-----------
Version      : 19.0.3
Directory    : /usr/lib/python3.7/site-packages/pip
----------MXNet Info-----------
Version      : 1.6.0
Directory    : /home/wkcn/proj/mxnet/python/mxnet
Commit hash file "/home/wkcn/proj/mxnet/python/mxnet/COMMIT_HASH" not found. Not installed from pre-built package or built from source.
Library      : ['/home/wkcn/proj/mxnet/python/mxnet/../../lib/libmxnet.so']

Package used (Python/R/Scala/Julia):
Python

Build info (Required if built from source)

Compiler (gcc/clang/mingw/visual studio): gcc

MXNet commit hash:
5f9a680

Build config:
make -j4 USE_OPENCV=1 USE_CPP_PACKAGE=1

Minimum reproducible example

import mxnet as mx
import numpy as np

a = mx.nd.array([np.inf, np.inf])
print(a)
print(mx.nd.min(a), mx.nd.max(a))

print('======')

a = -a
print(a)
print(mx.nd.min(a), mx.nd.max(a))

It shows the output as follow:

[inf inf]
<NDArray 2 @cpu(0)>

[3.4028235e+38]
<NDArray 1 @cpu(0)>
[inf]
<NDArray 1 @cpu(0)>
======

[-inf -inf]
<NDArray 2 @cpu(0)>

[-inf]
<NDArray 1 @cpu(0)>
[-3.4028235e+38]
<NDArray 1 @cpu(0)>

[mxnet-label-bot]

Hey, this is the MXNet Label Bot.
Thank you for submitting the issue! I will try and suggest some labels so that the appropriate MXNet community members can help resolve it.
Here are my recommended label(s): Bug

[wkcn]

Close it since the issue has been addressed in PR #16226