aarmey opened a new issue #19891:
URL: https://github.com/apache/incubator-mxnet/issues/19891
## Description
Multiplying a bool/int-typed array with a scalar float promotes the output
type to a float in Numpy. I believe this also happens using the older MXNet
interface. However, MXNet.numpy arrays retain their old type.
### Error Message
There is no error message, just inconsistent behavior compared to Numpy.
## To Reproduce
```python
import mxnet as mx
from mxnet import numpy as np
A = np.array([0, 1, 0], dtype=np.bool)
B = np.array([0, 1, 2], dtype=np.int64)
C = np.array([0, 1, 2], dtype=np.float64)
print(A * 3.9)
print(B * 3.9)
print(C * 3.9)
```
Outputs:
```
[0 3 0]
[0 3 6]
[0. 3.9 7.8]
```
## Environment
<details>
<summary>Environment Information</summary>
----------Python Info----------
Version : 3.8.6
Compiler : GCC 9.3.0
Build : ('default', 'Oct 26 2020 14:01:59')
Arch : ('64bit', 'ELF')
------------Pip Info-----------
Version : 21.0.1
Directory : /usr/local/lib/python3.8/site-packages/pip
----------MXNet Info-----------
Version : 1.7.0
Directory : /usr/local/lib/python3.8/site-packages/mxnet
Commit Hash : 64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
64f737cdd59fe88d2c5b479f25d011c5156b6a8a
Library : ['/usr/local/lib/python3.8/site-packages/mxnet/libmxnet.so']
Build features:
✖ CUDA
✖ CUDNN
✖ NCCL
✖ CUDA_RTC
✖ TENSORRT
✔ CPU_SSE
✔ CPU_SSE2
✔ CPU_SSE3
✔ CPU_SSE4_1
✔ CPU_SSE4_2
✖ CPU_SSE4A
✔ CPU_AVX
✖ CPU_AVX2
✔ OPENMP
✖ SSE
✔ F16C
✖ JEMALLOC
✔ BLAS_OPEN
✖ BLAS_ATLAS
✖ BLAS_MKL
✖ BLAS_APPLE
✔ LAPACK
✔ MKLDNN
✔ OPENCV
✖ CAFFE
✖ PROFILER
✔ DIST_KVSTORE
✖ CXX14
✖ INT64_TENSOR_SIZE
✔ SIGNAL_HANDLER
✖ DEBUG
✖ TVM_OP
----------System Info----------
Platform : Linux-5.8.0-41-generic-x86_64-with-glibc2.2.5
system : Linux
node : aretha
release : 5.8.0-41-generic
version : #46-Ubuntu SMP Mon Jan 18 16:48:44 UTC 2021
----------Hardware Info----------
machine : x86_64
processor : x86_64
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 43 bits physical, 48 bits virtual
CPU(s): 32
On-line CPU(s) list: 0-31
Thread(s) per core: 2
Core(s) per socket: 16
Socket(s): 1
NUMA node(s): 2
Vendor ID: AuthenticAMD
CPU family: 23
Model: 1
Model name: AMD Ryzen Threadripper 1950X 16-Core
Processor
Stepping: 1
Frequency boost: enabled
CPU MHz: 2561.528
CPU max MHz: 3400.0000
CPU min MHz: 2200.0000
BogoMIPS: 6786.49
Virtualization: AMD-V
L1d cache: 512 KiB
L1i cache: 1 MiB
L2 cache: 8 MiB
L3 cache: 32 MiB
NUMA node0 CPU(s): 0-7,16-23
NUMA node1 CPU(s): 8-15,24-31
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Not affected
Vulnerability Mds: Not affected
Vulnerability Meltdown: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass
disabled via prctl and seccomp
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and
__user pointer sanitization
Vulnerability Spectre v2: Mitigation; Full AMD retpoline, STIBP
disabled, RSB filling
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep
mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt
pdpe1gb rdtscp lm constant_tsc rep_good
nopl nonstop_tsc cpuid extd_apicid amd_dcm aperfmperf pni pclmulqdq monitor
ssse3 fma
cx16 sse4_1 sse4_2 movbe popcnt aes xsave
avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse
3dnow
prefetch osvw skinit wdt tce topoext
perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate sme ssbd sev
vmmcall fsgsba
se bmi1 avx2 smep bmi2 rdseed adx smap
clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat
npt lbrv
svm_lock nrip_save tsc_scale vmcb_clean
flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif
overflow_re
cov succor smca
----------Network Test----------
Setting timeout: 10
Timing for MXNet: https://github.com/apache/incubator-mxnet, DNS: 0.0054
sec, LOAD: 0.4757 sec.
Timing for Gluon Tutorial(en): http://gluon.mxnet.io, DNS: 0.2448 sec, LOAD:
0.2354 sec.
Error open Gluon Tutorial(cn): https://zh.gluon.ai, <urlopen error [SSL:
CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired
(_ssl.c:1124)>, DNS finished in 0.970501184463501 sec.
Timing for FashionMNIST:
https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/gluon/dataset/fashion-mnist/train-labels-idx1-ubyte.gz,
DNS: 0.0352 sec, LOAD: 0.0971 sec.
Timing for PYPI: https://pypi.python.org/pypi/pip, DNS: 0.0439 sec, LOAD:
0.3022 sec.
Error open Conda: https://repo.continuum.io/pkgs/free/, HTTP Error 403:
Forbidden, DNS finished in 0.16263580322265625 sec.
----------Environment----------
KMP_DUPLICATE_LIB_OK="True"
KMP_INIT_AT_FORK="FALSE"
</details>
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