Issue: Loading Data From S3 Path in Sagemaker

In Sagemaker Im tring to load the data set from S3 path as follows

`train_path = 's3://xxxxxxxxxx/xxxxxxxxxx/train.csv'
    valid_path = 's3://xxxxxxxxxx/xxxxxxxxxx/validation.csv'
    test_path = 's3://xxxxxxxxxx/xxxxxxxxxx/test.csv'
    
    data_files = {}
    data_files["train"] = train_path
    data_files["validation"] = valid_path
    data_files["test"] = test_path
    extension = train_path.split(".")[-1]
    datasets = load_dataset(extension, data_files=data_files, s3_enabled=True)
    print(datasets)`


I getting an error of

`algo-1-7plil_1  |   File "main.py", line 21, in <module>
algo-1-7plil_1  |     datasets = load_dataset(extension, data_files=data_files)
algo-1-7plil_1  |   File "/opt/conda/lib/python3.6/site-packages/datasets/load.py", line 603, in load_dataset
algo-1-7plil_1  |     **config_kwargs,
algo-1-7plil_1  |   File "/opt/conda/lib/python3.6/site-packages/datasets/builder.py", line 155, in __init__
algo-1-7plil_1  |     **config_kwargs,
algo-1-7plil_1  |   File "/opt/conda/lib/python3.6/site-packages/datasets/builder.py", line 305, in _create_builder_config
algo-1-7plil_1  |     m.update(str(os.path.getmtime(data_file)))
algo-1-7plil_1  |   File "/opt/conda/lib/python3.6/genericpath.py", line 55, in getmtime
algo-1-7plil_1  |     return os.stat(filename).st_mtime
algo-1-7plil_1  | FileNotFoundError: [Errno 2] No such file or directory: 's3://lsmv-sagemaker/pubmedbert/test.csv`

But when im trying with pandas , it is able to load from S3

Does the datasets library support S3 path to load

Comments:
This would be a neat feature

> neat feature

I dint get these clearly, can you please elaborate like how to work on these 

It could maybe work almost out of the box just by using `cached_path` in the text/csv/json scripts, no?

Thanks thomwolf and julien-c

I'm still confusion on what you guys said, 

I have solved the problem as follows:

1. read the csv file using pandas from s3 
2. Convert to dictionary key as column name and values as list column data
3. convert it to Dataset using 
`from datasets import Dataset`
`train_dataset = Dataset.from_dict(train_dict)`

We were brainstorming around your use-case.

Let's keep the issue open for now, I think this is an interesting question to think about.

> We were brainstorming around your use-case.
> 
> Let's keep the issue open for now, I think this is an interesting question to think about.

Sure thomwolf, Thanks for your concern 

I agree it would be cool to have that feature. Also that's good to know that pandas supports this.
For the moment I'd suggest to first download the files locally as thom suggested and then load the dataset by providing paths to the local files

Don't get


Any updates on this issue?
I face a similar issue. I have many parquet files in S3 and I would like to train on them. 
To be honest I even face issues with only getting the last layer embedding out of them.

Hi dorlavie, 
You can find one solution that i have mentioned above, that can help you. 
And there is one more solution also which is downloading files locally


> Hi dorlavie,
> You can find one solution that i have mentioned above, that can help you.
> And there is one more solution also which is downloading files locally

mahesh1amour, thanks for the fast reply

Unfortunately, in my case I can not read with pandas. The dataset is too big (50GB). 
In addition, due to security concerns I am not allowed to save the data locally

@dorlavie could use `boto3` to download the data to your local machine and then load it with `dataset`

boto3 example [documentation](https://boto3.amazonaws.com/v1/documentation/api/latest/guide/s3-example-download-file.html)
```python
import boto3

s3 = boto3.client('s3')
s3.download_file('BUCKET_NAME', 'OBJECT_NAME', 'FILE_NAME')
```

datasets example [documentation](https://huggingface.co/docs/datasets/loading_datasets.html)

```python
from datasets import load_dataset
dataset = load_dataset('csv', data_files=['my_file_1.csv', 'my_file_2.csv', 'my_file_3.csv'])
```


Thanks @philschmid for the suggestion.
As I mentioned in the previous comment, due to security issues I can not save the data locally.
I need to read it from S3 and process it directly.

I guess that many other people try to train / fit those models on huge datasets (e.g entire Wiki), what is the best practice in those cases?

If I understand correctly you're not allowed to write data on disk that you downloaded from S3 for example ?
Or is it the use of the `boto3` library that is not allowed in your case ?

@lhoestq yes you are correct.
I am not allowed to save the "raw text" locally - The "raw text" must be saved only on S3.
I am allowed to save the output of any model locally. 
It doesn't matter how I do it boto3/pandas/pyarrow, it is forbidden

@dorlavie are you using sagemaker for training too? Then you could use S3 URI, for example `s3://my-bucket/my-training-data` and pass it within the `.fit()` function when you start the sagemaker training job. Sagemaker would then download the data from s3 into the training runtime and you could load it from disk

**sagemaker start training job**
```python
pytorch_estimator.fit({'train':'s3://my-bucket/my-training-data','eval':'s3://my-bucket/my-evaluation-data'})
```

**in the train.py script**
```python
from datasets import load_from_disk

train_dataset = load_from_disk(os.environ['SM_CHANNEL_TRAIN'])
```

I have created an example of how to use transformers and datasets with sagemaker. 
https://github.com/philschmid/huggingface-sagemaker-example/tree/main/03_huggingface_sagemaker_trainer_with_data_from_s3

The example contains a jupyter notebook `sagemaker-example.ipynb` and an `src/` folder. The sagemaker-example is a jupyter notebook that is used to create the training job on AWS Sagemaker. The `src/` folder contains the `train.py`, our training script, and `requirements.txt` for additional dependencies.