Removed Colab instructions (#81)

(Being moved to separate repo)

docs/experiments-msmarco-passage.md

@@ -153,37 +153,6 @@ You should see the same result.
 If you were able to replicate these results, please submit a PR adding to the replication log!
 
 
-## Replication on Colab
-
-For users without local GPU resources, Colab is an available solution. It could be transformed into a GPU instance with full SSH access.
-
-First of all, create a Colab notebook using your Google account and use the GPU runtime mode.
-[Ngrok](https://ngrok.com/) is used to make ssh forwarding. Before this, please create a password. Then, let's start `sshd`.
-Let's setup and run `sshd`.
-```
-! apt-get install -qq -o=Dpkg::Use-Pty=0 openssh-server pwgen > /dev/null
-! echo root:$password | chpasswd
-! mkdir -p /var/run/sshd
-! echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
-! echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config
-get_ipython().system_raw('/usr/sbin/sshd -D &')
-```
-After that, we can install and run Ngrok, which creates a TCP tunnel.
-You can get authtoken from https://dashboard.ngrok.com/auth".
-```
-! wget -q -c -nc https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip
-! unzip -qq -n ngrok-stable-linux-amd64.zip
-import getpass
-authtoken = getpass.getpass()
-get_ipython().system_raw('./ngrok authtoken $authtoken && ./ngrok tcp 22 &')
-```
-Now, You can access your server through `ssh` command in your local machine.
-The Port number can be found through the Ngrok interface https://dashboard.ngrok.com/status.
-```
-ssh [email protected] -p [port_number]
-```
-
-
 ## Replication Log
 
 + Results replicated by [@MXueguang](https://github.com/MXueguang) on 2020-05-22 (commit [`69de7db`](https://github.com/castorini/pygaggle/commit/69de7db843bbe9201113c4d94c9e90be36094350)) (Tesla P4)