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Posted to commits@mxnet.apache.org by GitBox <gi...@apache.org> on 2020/08/27 19:10:36 UTC
[GitHub] [incubator-mxnet] karan6181 opened a new issue #19027: mx.nd.argsort() output is different on CPU and GPU
karan6181 opened a new issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027
## Description
The `mx.nd.argsort()` output is different on CPU and GPU for certain edge cases
## Script
```python
import mxnet as mx
import numpy as np
def get_array(row, col):
return [[float(1.0) if k<=2 else float(0.0) for k in range(col)] for _ in range(row)]
x = get_array(4, 4)
y = get_array(4, 4)
a_cpu = mx.nd.array(x, ctx=mx.cpu())
a_gpu = mx.nd.array(y, ctx=mx.gpu())
print("======================= Input ============================")
print(a_cpu)
print("======================= MXNet Ascending order ============================")
print("CPU: ", a_cpu.argsort(axis=1, is_ascend=True))
print("GPU: ", a_gpu.argsort(axis=1, is_ascend=True))
print("======================= MXNet Descending order ============================")
print("CPU: ", a_cpu.argsort(axis=1, is_ascend=False))
print("GPU: ", a_gpu.argsort(axis=1, is_ascend=False))
print("======================= Numpy ============================")
a_cpu_np = a_cpu.asnumpy()
print("CPU: \n", np.argsort(a_cpu.asnumpy(), axis=1))
```
### Output
```bash
======================= Input ============================
[[1. 1. 1. 0.]
[1. 1. 1. 0.]
[1. 1. 1. 0.]
[1. 1. 1. 0.]]
<NDArray 4x4 @cpu(0)>
======================= MXNet Ascending order ============================
CPU:
[[3. 0. 1. 2.]
[3. 0. 1. 2.]
[3. 0. 1. 2.]
[3. 0. 1. 2.]]
<NDArray 4x4 @cpu(0)>
GPU:
[[3. 0. 2. 1.]
[3. 0. 2. 1.]
[3. 0. 2. 1.]
[3. 0. 2. 1.]]
<NDArray 4x4 @gpu(0)>
======================= MXNet Descending order ============================
CPU:
[[0. 1. 2. 3.]
[0. 1. 2. 3.]
[0. 1. 2. 3.]
[0. 1. 2. 3.]]
<NDArray 4x4 @cpu(0)>
GPU:
[[0. 2. 1. 3.]
[0. 2. 1. 3.]
[0. 2. 1. 3.]
[0. 2. 1. 3.]]
<NDArray 4x4 @gpu(0)>
======================= Numpy ============================
CPU:
[[3 0 1 2]
[3 0 1 2]
[3 0 1 2]
[3 0 1 2]]
```
## Environment
We recommend using our script for collecting the diagnositc information. Run the following command and paste the outputs below:
```
curl --retry 10 -s https://raw.githubusercontent.com/dmlc/gluon-nlp/master/tools/diagnose.py | python
----------Python Info----------
Version : 3.8.3
Compiler : GCC 7.3.0
Build : ('default', 'May 19 2020 18:47:26')
Arch : ('64bit', 'ELF')
------------Pip Info-----------
Version : 20.0.2
Directory : /shared/mxnet_env/lib/python3.8/site-packages/pip
----------MXNet Info-----------
Version : 1.6.0
Directory : /shared/mxnet_env/lib/python3.8/site-packages/mxnet
Num GPUs : 8
Commit Hash : 6eec9da55c5096079355d1f1a5fa58dcf35d6752
----------System Info----------
Platform : Linux-4.15.0-1060-aws-x86_64-with-glibc2.10
system : Linux
node : ip-192-168-70-218
release : 4.15.0-1060-aws
version : #62-Ubuntu SMP Tue Feb 11 21:23:22 UTC 2020
----------Hardware Info----------
machine : x86_64
processor : x86_64
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 96
On-line CPU(s) list: 0-95
Thread(s) per core: 2
Core(s) per socket: 24
Socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz
Stepping: 4
CPU MHz: 1201.597
BogoMIPS: 4999.99
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 33792K
NUMA node0 CPU(s): 0-23,48-71
NUMA node1 CPU(s): 24-47,72-95
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves ida arat pku ospke
----------Network Test----------
Setting timeout: 10
Timing for MXNet: https://github.com/apache/incubator-mxnet, DNS: 0.0040 sec, LOAD: 0.6617 sec.
Timing for GluonNLP GitHub: https://github.com/dmlc/gluon-nlp, DNS: 0.0009 sec, LOAD: 0.3580 sec.
Timing for GluonNLP: http://gluon-nlp.mxnet.io, DNS: 0.0347 sec, LOAD: 0.1685 sec.
Timing for D2L: http://d2l.ai, DNS: 0.1150 sec, LOAD: 0.0382 sec.
Timing for D2L (zh-cn): http://zh.d2l.ai, DNS: 0.1203 sec, LOAD: 0.2038 sec.
Timing for FashionMNIST: https://repo.mxnet.io/gluon/dataset/fashion-mnist/train-labels-idx1-ubyte.gz, DNS: 0.0773 sec, LOAD: 0.3685 sec.
Timing for PYPI: https://pypi.python.org/pypi/pip, DNS: 0.0024 sec, LOAD: 0.0772 sec.
Error open Conda: https://repo.continuum.io/pkgs/free/, HTTP Error 403: Forbidden, DNS finished in 0.02059340476989746 sec.
```
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[GitHub] [incubator-mxnet] sandeep-krishnamurthy commented on issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
sandeep-krishnamurthy commented on issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027#issuecomment-683349911
Thank you both.
----------------------------------------------------------------
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[GitHub] [incubator-mxnet] sandeep-krishnamurthy commented on issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
sandeep-krishnamurthy commented on issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027#issuecomment-683173399
> argsort does not guarantee to be stable.
@szha => Can you please elaborate what it means?
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[GitHub] [incubator-mxnet] marcoabreu commented on issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
marcoabreu commented on issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027#issuecomment-683334533
See the "Notes" section here: https://numpy.org/doc/stable/reference/generated/numpy.sort.html
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[GitHub] [incubator-mxnet] sandeep-krishnamurthy closed issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
sandeep-krishnamurthy closed issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027
----------------------------------------------------------------
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[GitHub] [incubator-mxnet] szha commented on issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
szha commented on issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027#issuecomment-682170300
argsort does not guarantee to be stable.
----------------------------------------------------------------
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[GitHub] [incubator-mxnet] szha commented on issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
szha commented on issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027#issuecomment-683175415
Unstable sort means for equal values the output order doesn't preserve the input orders
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[GitHub] [incubator-mxnet] szha closed issue #19027: mx.nd.argsort() output is different on CPU and GPU
Posted by GitBox <gi...@apache.org>.
szha closed issue #19027:
URL: https://github.com/apache/incubator-mxnet/issues/19027
----------------------------------------------------------------
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