Couldn't cast array of type string error with cast_column
Author: R4ZZ3
State: closed
Labels: name: bug

## Describe the bug


In OVH cloud during Huggingface Robust-speech-recognition event on a AI training notebook instance using jupyter lab and running jupyter notebook When using the dataset.cast_column("audio",Audio(sampling_rate=16_000))
method I get error
![image](https://user-images.githubusercontent.com/25264037/152214027-9c42a71a-dd24-463c-a346-57e0287e5a8f.png)

This was working with datasets version 1.17.1.dev0
but now with version 1.18.3 produces the error above.

## Steps to reproduce the bug

load dataset:
![image](https://user-images.githubusercontent.com/25264037/152216145-159553b6-cddc-4f0b-8607-7e76b600e22a.png)


remove columns:
![image](https://user-images.githubusercontent.com/25264037/152214707-7c7e89d1-87d8-4b4f-8cfc-5d7223d35644.png)

run my fix_path function.
This also creates the audio column that is referring to the absolute file path of the audio

![image](https://user-images.githubusercontent.com/25264037/152214773-51f71ccf-d31b-4449-b63a-1af56436e49f.png)

Then I concatenate few other datasets and finally try the cast_column method
![image](https://user-images.githubusercontent.com/25264037/152215032-f341ec86-9d6d-48c9-943b-e2efe37a4d98.png)

but get error:
![image](https://user-images.githubusercontent.com/25264037/152215073-b85bd057-98e8-413c-9b05-51e9805f2c24.png)




## Expected results
A clear and concise description of the expected results.

## Actual results
Specify the actual results or traceback.

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.18.3
- Platform: 
OVH Cloud, AI Training section, container for Huggingface Robust Speech Recognition event image(baaastijn/ovh_huggingface)
![image](https://user-images.githubusercontent.com/25264037/152215161-b4ff7bfb-2736-4afb-9223-761a3338d23c.png)

- Python version: 3.8.8
- PyArrow version:
![image](https://user-images.githubusercontent.com/25264037/152215936-4d365760-557e-456b-b5eb-ad1d15cf5073.png)



Comments: Hi ! I wasn't able to reproduce the error, are you still experiencing this ? I tried calling `cast_column` on a string column containing paths.

If you manage to share a reproducible code example that would be perfect

Hi,

I think my team mate got this solved. Clolsing it for now and will reopen if I experience this again.
Thanks :) 

Hi @R4ZZ3,

If it is not too much of a bother, can you please help me how to resolve this error? I am exactly getting the same error where I am going as per the documentation guideline:

`my_audio_dataset = my_audio_dataset.cast_column("audio_paths", Audio())`

where `"audio_paths"` is a dataset column (feature) having strings of absolute paths to mp3 files of the dataset.



I was having the same issue with this code:

```
dataset = dataset.map(
    lambda batch: {"full_path" : os.path.join(self.data_path, batch["path"])},
    num_procs = 4
)
my_audio_dataset = dataset.cast_column("full_path", Audio(sampling_rate=16_000))
```

Removing the "num_procs" argument fixed it somehow.
Using a mac with m1 chip

Hi @Hubert-Bonisseur, I think this will be fixed by https://github.com/huggingface/datasets/pull/4614