load_dataset("amazon_polarity") NonMatchingChecksumError
Hi ! This issue may be related to #996 
This comes probably from the Quota Exceeded error from Google Drive.
Can you try again tomorrow and see if you still have the error ?

On my side I didn't get any error today with `load_dataset("amazon_polarity")` +1 encountering this issue as well @lhoestq Hi! I encounter the same error when loading `yelp_review_full`.

```
from datasets import load_dataset
dataset_yp = load_dataset("yelp_review_full")
```

When you say the "Quota Exceeded from Google drive". Is this a quota from the dataset owner? or the quota from our (the runner) Google Drive? +1 Also encountering this issue > When you say the "Quota Exceeded from Google drive". Is this a quota from the dataset owner? or the quota from our (the runner) Google Drive?

Each file on Google Drive can be downloaded only a certain amount of times per day because of a quota. The quota is reset every day. So if too many people download the dataset the same day, then the quota is likely to exceed.
That's a really bad limitations of Google Drive and we should definitely find another host for these dataset than Google Drive.
For now I would suggest to wait and try again later..

So far the issue happened with CNN DailyMail, Amazon Polarity and Yelp Reviews. 
Are you experiencing the issue with other datasets ? @calebchiam @dtch1997  @lhoestq Gotcha, that is quite problematic...for what it's worth, I've had no issues with the other datasets I tried, such as `yelp_reviews_full` and `amazon_reviews_multi`. Same issue today with "big_patent", though the symptoms are slightly different.

When running

```py
from datasets import load_dataset
load_dataset("big_patent", split="validation")
```

I get the following
`FileNotFoundError: Local file \huggingface\datasets\downloads\6159313604f4f2c01e7d1cac52139343b6c07f73f6de348d09be6213478455c5\bigPatentData\train.tar.gz doesn't exist`

I had to look into `6159313604f4f2c01e7d1cac52139343b6c07f73f6de348d09be6213478455c5`  (which is a file instead of a folder) and got the following:

`<!DOCTYPE html><html><head><title>Google Drive - Quota exceeded</title><meta http-equiv="content-type" content="text/html; charset=utf-8"/><link href=&#47;static&#47;doclist&#47;client&#47;css&#47;4033072956&#45;untrustedcontent.css rel="stylesheet" nonce="JV0t61Smks2TEKdFCGAUFA"><link rel="icon" href="//ssl.gstatic.com/images/branding/product/1x/drive_2020q4_32dp.png"/><style nonce="JV0t61Smks2TEKdFCGAUFA">#gbar,#guser{font-size:13px;padding-top:0px !important;}#gbar{height:22px}#guser{padding-bottom:7px !important;text-align:right}.gbh,.gbd{border-top:1px solid #c9d7f1;font-size:1px}.gbh{height:0;position:absolute;top:24px;width:100%}@media all{.gb1{height:22px;margin-right:.5em;vertical-align:top}#gbar{float:left}}a.gb1,a.gb4{text-decoration:underline !important}a.gb1,a.gb4{color:#00c !important}.gbi .gb4{color:#dd8e27 !important}.gbf .gb4{color:#900 !important}
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Hi, it seems that loading the amazon_polarity dataset gives a NonMatchingChecksumError.

To reproduce:
```
load_dataset("amazon_polarity")
```
This will give the following error:
```
---------------------------------------------------------------------------
NonMatchingChecksumError                  Traceback (most recent call last)
<ipython-input-3-8559a03fe0f8> in <module>()
----> 1 dataset = load_dataset("amazon_polarity")

3 frames
/usr/local/lib/python3.6/dist-packages/datasets/utils/info_utils.py in verify_checksums(expected_checksums, recorded_checksums, verification_name)
     37     if len(bad_urls) > 0:
     38         error_msg = "Checksums didn't match" + for_verification_name + ":\n"
---> 39         raise NonMatchingChecksumError(error_msg + str(bad_urls))
     40     logger.info("All the checksums matched successfully" + for_verification_name)
     41 

NonMatchingChecksumError: Checksums didn't match for dataset source files:
['https://drive.google.com/u/0/uc?id=0Bz8a_Dbh9QhbaW12WVVZS2drcnM&export=download']
```