from datasets import Dataset is failing 
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Hi @kswamy15, thanks for reporting.

We are fixing this critical issue and making an urgent patch release of the `datasets` library today.

In the meantime, you can circumvent this issue by updating the `tqdm` library: `!pip install -U tqdm`
## Describe the bug
A clear and concise description of what the bug is.

## Steps to reproduce the bug
```python
# Sample code to reproduce the bug
from datasets import Dataset
```

## Expected results
A clear and concise description of the expected results.

## Actual results
Specify the actual results or traceback.
/usr/local/lib/python3.7/dist-packages/datasets/utils/file_utils.py in <module>()
     25 import posixpath
     26 import requests
---> 27 from tqdm.contrib.concurrent import thread_map
     28 
     29 from .. import __version__, config, utils

ModuleNotFoundError: No module named 'tqdm.contrib.concurrent'

---------------------------------------------------------------------------
NOTE: If your import is failing due to a missing package, you can
manually install dependencies using either !pip or !apt.

To view examples of installing some common dependencies, click the
"Open Examples" button below.
---------------------------------------------------------------------------

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: latest version as of 07/21/2021
- Platform: Google Colab
- Python version: 3.7
- PyArrow version:

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