yongyi-wu opened a new issue #19777:
URL: https://github.com/apache/incubator-mxnet/issues/19777
## Description
I used `np.pad()` just for some basic operations, but it fails without
giving any informative error message. I tried different inputs, but the
function fails every time.
### Error Message
```shell
terminate called after throwing an instance of 'dmlc::Error'
what(): [09:43:08] ../include/mxnet/runtime/object.h:809: Check failed:
ref->template IsInstance<typename SubRef::ContainerType>(): Downcast from
```
## To Reproduce
```python
from mxnet import np, npx
npx.set_np()
A = np.array([1, 2, 3, 4])
np.pad(A, pad_width=(1, 2))
```
## Environment
<details>
<summary>Environment Information</summary>
```
----------Python Info----------
Version : 3.6.9
Compiler : GCC 8.4.0
Build : ('default', 'Oct 8 2020 12:12:24')
Arch : ('64bit', 'ELF')
------------Pip Info-----------
Version : 20.3.3
Directory : /home/ubuntu/env/nlp/lib/python3.6/site-packages/pip
----------MXNet Info-----------
Version : 2.0.0
Directory : /home/ubuntu/env/nlp/lib/python3.6/site-packages/mxnet
Commit hash file
"/home/ubuntu/env/nlp/lib/python3.6/site-packages/mxnet/COMMIT_HASH" not found.
Not installed from pre-built package or built from source.
Library :
['/home/ubuntu/env/nlp/lib/python3.6/site-packages/mxnet/libmxnet.so']
Build features:
✔ CUDA
✔ CUDNN
✖ NCCL
✖ TENSORRT
✖ CUTENSOR
✔ 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
✔ DIST_KVSTORE
✔ INT64_TENSOR_SIZE
✔ SIGNAL_HANDLER
✖ DEBUG
✖ TVM_OP
----------System Info----------
Platform : Linux-5.4.0-1034-aws-x86_64-with-Ubuntu-18.04-bionic
system : Linux
node : ip-10-21-7-56
release : 5.4.0-1034-aws
version : #35~18.04.1-Ubuntu SMP Fri Dec 18 01:06:34 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): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
Stepping: 7
CPU MHz: 3193.734
BogoMIPS: 4999.99
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 36608K
NUMA node0 CPU(s): 0-7
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 rep_good nopl xtopology nonstop_tsc cpuid aperfmperf
tsc_known_freq pni pclmulqdq 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 avx2 smep bmi2 erms
invpcid mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw
avx512vl xsaveopt xsavec xgetbv1 xsaves ida arat pku ospke avx512_vnni
----------Network Test----------
Setting timeout: 10
Timing for MXNet: https://github.com/apache/incubator-mxnet, DNS: 0.0017
sec, LOAD: 0.5337 sec.
Timing for Gluon Tutorial(en): http://gluon.mxnet.io, DNS: 0.2078 sec, LOAD:
0.1377 sec.
Error open Gluon Tutorial(cn): https://zh.gluon.ai, <urlopen error [SSL:
CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:852)>, DNS
finished in 0.04438376426696777 sec.
Timing for FashionMNIST:
https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/gluon/dataset/fashion-mnist/train-labels-idx1-ubyte.gz,
DNS: 0.0067 sec, LOAD: 0.1069 sec.
Timing for PYPI: https://pypi.python.org/pypi/pip, DNS: 0.0014 sec, LOAD:
0.2587 sec.
Error open Conda: https://repo.continuum.io/pkgs/free/, HTTP Error 403:
Forbidden, DNS finished in 0.021787643432617188 sec.
----------Environment----------
```
</details>
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