ryankshah opened a new issue #12674:
URL: https://github.com/apache/arrow/issues/12674
Hi all,
For reference I am using `numpy=1.22.3` and `pyarrow=7.0.0`.
I am aiming to create a dataset (and store in feather format) for STFT data
from digital signal analysis, with the STFT array in the type/shape: `<class
'numpy.ndarray'> \\ (10001, 401)`. An example of this data is:
```
[[ 1.24496163e-03+0.0000000e+00j 1.17749616e-04+0.0000000e+00j
8.92068347e-05+0.0000000e+00j ... -3.55575146e-04+0.0000000e+00j
-3.53000971e-04+0.0000000e+00j -1.35809695e-03+0.0000000e+00j]
[-1.20925368e-03+2.0470628e-05j -5.52154524e-05-3.7754296e-05j
-7.05739149e-05-7.2288349e-05j ... 2.85753951e-04+4.1393949e-05j
1.60366966e-04-2.7969104e-04j 1.15900207e-03+2.3369875e-04j]
[ 1.19788689e-03+3.3121873e-05j -6.23480264e-06+4.2733776e-05j
4.23972924e-05+8.2590450e-05j ... -1.44452570e-04+8.9506881e-05j
-1.42675699e-05+1.8458923e-04j -9.61950631e-04-1.2690650e-04j]
...
[-1.11952168e-05+1.8826026e-06j 3.46628576e-06-2.0878474e-06j
-1.54314409e-06-2.8386687e-06j ... -1.41124383e-06-2.3261330e-06j
-5.40845519e-07-2.5624531e-06j 1.46134671e-05-1.2955890e-06j]
[ 8.70186886e-06-2.8798408e-06j -3.47046830e-06+4.1321928e-06j
1.99560964e-06-2.9683741e-07j ... -3.09421989e-06+8.9018937e-07j
-1.19136712e-06+2.9354976e-06j -1.56483602e-05+6.8048553e-07j]
[-6.49670437e-06+0.0000000e+00j 4.49650315e-06+0.0000000e+00j
-2.71528188e-06+0.0000000e+00j ... 6.58240697e-06+0.0000000e+00j
3.21866310e-06+0.0000000e+00j 1.57587510e-05+0.0000000e+00j]]
```
This data is being stored in a dataframe and written to feather as follows:
`feather.write_feather(pd.DataFrame([{'id': i, 'movement': y, 'distance':
movedist, 'speed': speed, 'signal': Zxx}]), dataset_file)` with the
`dataset_file` reference pointing to a `with open(.., 'wb') as dataset_file`.
The error I am getting is:
> Traceback (most recent call last):
> File "analyse_cvnn.py", line 108, in <module>
> feather.write_feather(pd.DataFrame([{'id': i, 'movement': y,
'distance': movedist, 'speed': speed, 'signal': Zxx}]), dataset_file)
> File "C:\Python38\lib\site-packages\pyarrow\feather.py", line 154, in
write_feather
> table = Table.from_pandas(df, preserve_index=False)
> File "pyarrow\table.pxi", line 1782, in pyarrow.lib.Table.from_pandas
> File "C:\Python38\lib\site-packages\pyarrow\pandas_compat.py", line 594,
in dataframe_to_arrays
> arrays = [convert_column(c, f)
> File "C:\Python38\lib\site-packages\pyarrow\pandas_compat.py", line 594,
in <listcomp>
> arrays = [convert_column(c, f)
> File "C:\Python38\lib\site-packages\pyarrow\pandas_compat.py", line 581,
in convert_column
> raise e
> File "C:\Python38\lib\site-packages\pyarrow\pandas_compat.py", line 575,
in convert_column
> result = pa.array(col, type=type_, from_pandas=True, safe=safe)
> File "pyarrow\array.pxi", line 312, in pyarrow.lib.array
> File "pyarrow\array.pxi", line 83, in pyarrow.lib._ndarray_to_array
> File "pyarrow\error.pxi", line 120, in pyarrow.lib.check_status
> pyarrow.lib.ArrowNotImplementedError: ('Unsupported numpy type 14',
'Conversion failed for column signal with type object')
I am running Windows 10 x64, 16GB RAM, Python 3.8.2
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