Importing data to Google Colaboratory

Google Colaboratory is a Jupyter Notebook enviornment that doesn't require any setup and completely runs in the cloud.
The notebooks are stored on Google Drive, so it can be easily shared. Over all of this, one of the major selling points is that they are giving free computation on GPUs for upto 12 hours in a single session. And because of all these reason, I have been writing all my python code on Google Colab for the last couple of weeks. But one of the major issues I faced was importing data to the notebook. Since the intances are created on the fly, the data gets deleted once the notebook is closed, so we need to keep on transferring it again and again and there isn't a simple way to transfer data unless you have your data hosted somewhere where you can use something like wget.

So, I compiled a list of ways to import data to Google Colab:

Using wget

The Google Colab machines are built on Debian based linux, therefore the simplest way for downloading data is wget or your faviorite tool for
downloading data.

wget url_to_data

Using google.colab python module

Google Colaboratory provided a python module google.colab with some utility tools, one of which is transfering files from/to your local system.

from google.colab import files
files.upload()

This creates a button using which you can select the files you want to upload. But in my experience till now, this is the worst way since the
upload was super slow (Took me more than 2 minutes to upload 30 MBs) and no it wasn't my internet. And I couldn't exactly figure out any
possible reasons for the upload to be so slow.

Mount google drive using google-drive-ocamlfuse

Another possible option is to use google drive to store your data and mount your google drive on the machine using google-drive-ocamlfuse.

Installing google-drive-ocamlfuse:

!apt-get install -y -qq software-properties-common python-software-properties module-init-tools
!add-apt-repository -y ppa:alessandro-strada/ppa 2>&1 > /dev/null
!apt-get update -qq 2>&1 > /dev/null
!apt-get -y install -qq google-drive-ocamlfuse fuse

Authenticate and get credentials:

from google.colab import auth
auth.authenticate_user()
from oauth2client.client import GoogleCredentials
creds = GoogleCredentials.get_application_default()

Setting up google-drive-ocamlfuse:

import getpass
!google-drive-ocamlfuse -headless -id={creds.client_id} -secret={creds.client_secret} < /dev/null 2>&1 | grep URL
vcode = getpass.getpass()
!echo {vcode} | google-drive-ocamlfuse -headless -id={creds.client_id} -secret={creds.client_secret}

And then you can finally mount your google drive:

!mkdir gdrive
!google-drive-ocamlfuse gdrive
!ls gdrive

Getting data from google cloud storage using gsutil

Alternatively you can download data from google cloud storage.
Start by authenticating the user:

from google.colab import auth
auth.authenticate_user()

And set the project and download data:

project_id = 'Your_project_ID_here'

# Download the file.
!gsutil cp gs://{bucket_name}/{filename} {download_dir}

Another possible option is to mount the bucket using Cloud Storage Fuse but good luck setting the right permissions to access data :P.