khaotik opened a new issue #20405:
URL: https://github.com/apache/incubator-mxnet/issues/20405
## Description
A minor issue: `mx.numpy_extension.savez` does not accept array-dict with a
key starting with slash. This started to occur as soon as I upgraded to master
fork. It is also inconsistent with numpy behavior.
This function is used by `gluon.Block.save_parameters` methods.
### Error Message
```text
Traceback (most recent call last):
File "test.py", line 12, in <module>
mx.numpy_extension.savez('/tmp/m_mx', **{param_name:m})
File
"/media/LNXDATA/WKSP/dev/incubator-mxnet/python/mxnet/numpy_extension/utils.py",
line 122, in savez
check_call(_LIB.MXNDArraySave(c_str(file), mx_uint(len(handles)),
handles, keys))
File "/media/LNXDATA/WKSP/dev/incubator-mxnet/python/mxnet/base.py", line
246, in check_call
raise get_last_ffi_error()
mxnet.base.MXNetError: Traceback (most recent call last):
File "/home/khaotik/WKSP/dev/incubator-mxnet/src/serialization/cnpy.cc",
line 333
MXNetError: Check failed: mz_zip_writer_add_read_buf_callback(archive,
blob_name_npy.data(), npy_header_blob_read_callback,
static_cast<void*>(&callback_data), size_to_add, nullptr, nullptr, 0,
MZ_NO_COMPRESSION, nullptr, 0, nullptr, 0): invalid filename
```
## To Reproduce
```python
#!/usr/bin/env python
import numpy as np
import mxnet as mx
m_npy = np.random.rand(256,256).astype('float32')
m = mx.ndarray.from_numpy(m_npy)
param_name = '/op/m' # starts with a slash
np.savez('/tmp/m_np', **{param_name:m_npy}) # WORKS
mx.numpy_extension.savez('/tmp/m_mx', **{param_name:m}) # BROKEN
```
## What have you tried to solve it?
In file `python/mxnet/numpy_extension/utils.py`, substitute `NDArraySave`
with `NDArrayLegacySave` provides a temp fix.
Also, the issue can be avoided by not using slash as parameter name prefix.
## Environment
ubuntu 20.04
anaconda py 3.8.3
mxnet master branch commit cb5bd4ea8b6fc9b568c13747bdb006ac047b72b5
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