dibgerge opened a new issue #19720:
URL: https://github.com/apache/incubator-mxnet/issues/19720
## Description
When defining a `Categorical` distribution using `logit` and then trying to
display the distribution in the repl, it failed due to `KeyError: prob`. This
error will happen to any distribution which contains `cached_properties` as
part of its arguments declared `arg_contraints`.
### Error Message
```python
~/workplace/incubator-mxnet/python/mxnet/gluon/probability/distributions/distribution.py
in __repr__(self)
181 if 'symbol' not in mode.__name__:
182 for k, _ in self.arg_constraints.items():
--> 183 v = self.__dict__[k]
184 if isinstance(v, Number):
185 shape_v = ()
KeyError: 'prob'
```
## To Reproduce
```python
from mxnet import np
from mxnet.gluon.probability import Categorical
a = np.array([1, 2, 3])
dist = Categorical(1, logit=a)
>>> dist
#KeyError
```
## What have you tried to solve it?
Simply calling the undeclared `cached_property` first solves it. That is:
```python
a = np.array([1, 2, 3])
dist = Categorical(1, logit=a)
dist.prob
>>> dist
# Categorical(prob: size (3,), logit: size (3,), F: mxnet.ndarray,
event_dim: 0)
# ...Works
```
## Environment
***We recommend using our script for collecting the diagnostic information
with the following command***
`curl --retry 10 -s
https://raw.githubusercontent.com/apache/incubator-mxnet/master/tools/diagnose.py
| python3`
<details>
<summary>Environment Information</summary>
```
----------Python Info----------
Version : 3.7.8
Compiler : GCC 7.5.0
Build : ('default', 'Nov 17 2020 23:45:15')
Arch : ('64bit', '')
------------Pip Info-----------
Version : 20.3.3
Directory :
/home/ubuntu/software/anaconda3/envs/deep/lib/python3.7/site-packages/pip
----------MXNet Info-----------
Version : 2.0.0
Directory : /home/ubuntu/workplace/incubator-mxnet/python/mxnet
Commit hash file
"/home/ubuntu/workplace/incubator-mxnet/python/mxnet/COMMIT_HASH" not found.
Not installed from pre-built package or built from source.
Library :
['/home/ubuntu/workplace/incubator-mxnet/python/mxnet/../../build/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-5.4.0-1030-aws-x86_64-with-debian-buster-sid
system : Linux
node : ip-172-31-43-72
release : 5.4.0-1030-aws
version : #31~18.04.1-Ubuntu SMP Tue Nov 17 10:48:34 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): 36
On-line CPU(s) list: 0-35
Thread(s) per core: 2
Core(s) per socket: 18
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) Platinum 8124M CPU @ 3.00GHz
Stepping: 4
CPU MHz: 1505.072
BogoMIPS: 5999.99
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 25344K
NUMA node0 CPU(s): 0-35
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: 0.0019
sec, LOAD: 0.7875 sec.
Timing for Gluon Tutorial(en): http://gluon.mxnet.io, DNS: 0.0360 sec, LOAD:
0.0374 sec.
Error open Gluon Tutorial(cn): https://zh.gluon.ai, <urlopen error [SSL:
CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired
(_ssl.c:1091)>, DNS finished in 0.008315324783325195 sec.
Timing for FashionMNIST:
https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/gluon/dataset/fashion-mnist/train-labels-idx1-ubyte.gz,
DNS: 0.0127 sec, LOAD: 0.1201 sec.
Timing for PYPI: https://pypi.python.org/pypi/pip, DNS: 0.0018 sec, LOAD:
0.0826 sec.
Error open Conda: https://repo.continuum.io/pkgs/free/, HTTP Error 403:
Forbidden, DNS finished in 0.0003726482391357422 sec.
```
</details>
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