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More accurate steps to use aws instance (#1308) 

* More accurate steps to use aws instance

* change the // to #, change the words according to the comments
/develop-generalizationTraining-TrainerController
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      docs/Training-on-Amazon-Web-Service.md

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## Preconfigured AMI
We've prepared an preconfigured AMI for you with the ID: `ami-18642967` in the
We've prepared a preconfigured AMI for you with the ID: `ami-18642967` in the
(Ubuntu)](https://aws.amazon.com/marketplace/pp/B077GCH38C). If you want to do
training without the headless mode, you need to enable X Server on it. After
launching your EC2 instance using the ami and ssh into it, run the following
commands to enable it:
(Ubuntu)](https://aws.amazon.com/marketplace/pp/B077GCH38C). The AMI has been
tested with p2.xlarge instance. Furthermore, if you want to train without
headless mode, you need to enable X Server.
After launching your EC2 instance using the ami and ssh into it, run the
following commands to enable it:
//Start the X Server, press Enter to come to the command line
# Start the X Server, press Enter to come to the command line
//Check if Xorg process is running
//You will have a list of processes running on the GPU, Xorg should be in the list, as shown below
# Check if Xorg process is running
# You will have a list of processes running on the GPU, Xorg should be in the
# list, as shown below
/*
* Thu Jun 14 20:27:26 2018
* +-----------------------------------------------------------------------------+
* | NVIDIA-SMI 390.67 Driver Version: 390.67 |
* |-------------------------------+----------------------+----------------------+
* | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
* | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
* |===============================+======================+======================|
* | 0 Tesla K80 On | 00000000:00:1E.0 Off | 0 |
* | N/A 35C P8 31W / 149W | 9MiB / 11441MiB | 0% Default |
* +-------------------------------+----------------------+----------------------+
*
* +-----------------------------------------------------------------------------+
* | Processes: GPU Memory |
* | GPU PID Type Process name Usage |
* |=============================================================================|
* | 0 2331 G /usr/lib/xorg/Xorg 8MiB |
* +-----------------------------------------------------------------------------+
*/
//Make the ubuntu use X Server for display
# Thu Jun 14 20:27:26 2018
# +-----------------------------------------------------------------------------+
# | NVIDIA-SMI 390.67 Driver Version: 390.67 |
# |-------------------------------+----------------------+----------------------+
# | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
# | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
# |===============================+======================+======================|
# | 0 Tesla K80 On | 00000000:00:1E.0 Off | 0 |
# | N/A 35C P8 31W / 149W | 9MiB / 11441MiB | 0% Default |
# +-------------------------------+----------------------+----------------------+
#
# +-----------------------------------------------------------------------------+
# | Processes: GPU Memory |
# | GPU PID Type Process name Usage |
# |=============================================================================|
# | 0 2331 G /usr/lib/xorg/Xorg 8MiB |
# +-----------------------------------------------------------------------------+
# Make the ubuntu use X Server for display
$ export DISPLAY=:0
```

1. Install and setup Xorg:
```console
//Install Xorg
# Install Xorg
//Get the BusID information
# Get the BusID information
//Add the BusID information to your /etc/X11/xorg.conf file
# Add the BusID information to your /etc/X11/xorg.conf file
//Remove the Section "Files" from the /etc/X11/xorg.conf file
$ sudo vim /etc/X11/xorg.conf //And remove two lines that contain Section "Files" and EndSection
# Remove the Section "Files" from the /etc/X11/xorg.conf file
# And remove two lines that contain Section "Files" and EndSection
$ sudo vim /etc/X11/xorg.conf
//Download and install the latest Nvidia driver for ubuntu
# Download and install the latest Nvidia driver for ubuntu
//Disable Nouveau as it will clash with the Nvidia driver
# Disable Nouveau as it will clash with the Nvidia driver
$ sudo echo 'blacklist nouveau' | sudo tee -a /etc/modprobe.d/blacklist.conf
$ sudo echo 'options nouveau modeset=0' | sudo tee -a /etc/modprobe.d/blacklist.conf
$ sudo echo options nouveau modeset=0 | sudo tee -a /etc/modprobe.d/nouveau-kms.conf

4. Make sure there are no Xorg processes running:
```console
//Kill any possible running Xorg processes
//Note that you might have to run this command multiple times depending on how Xorg is configured.
# Kill any possible running Xorg processes
# Note that you might have to run this command multiple times depending on
# how Xorg is configured.
//Check if there is any Xorg process left
//You will have a list of processes running on the GPU, Xorg should not be in the list, as shown below.
# Check if there is any Xorg process left
# You will have a list of processes running on the GPU, Xorg should not be in
# the list, as shown below.
/*
* Thu Jun 14 20:21:11 2018
* +-----------------------------------------------------------------------------+
* | NVIDIA-SMI 390.67 Driver Version: 390.67 |
* |-------------------------------+----------------------+----------------------+
* | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
* | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
* |===============================+======================+======================|
* | 0 Tesla K80 On | 00000000:00:1E.0 Off | 0 |
* | N/A 37C P8 31W / 149W | 0MiB / 11441MiB | 0% Default |
* +-------------------------------+----------------------+----------------------+
*
* +-----------------------------------------------------------------------------+
* | Processes: GPU Memory |
* | GPU PID Type Process name Usage |
* |=============================================================================|
* | No running processes found |
* +-----------------------------------------------------------------------------+
*/
# Thu Jun 14 20:21:11 2018
# +-----------------------------------------------------------------------------+
# | NVIDIA-SMI 390.67 Driver Version: 390.67 |
# |-------------------------------+----------------------+----------------------+
# | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
# | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
# |===============================+======================+======================|
# | 0 Tesla K80 On | 00000000:00:1E.0 Off | 0 |
# | N/A 37C P8 31W / 149W | 0MiB / 11441MiB | 0% Default |
# +-------------------------------+----------------------+----------------------+
#
# +-----------------------------------------------------------------------------+
# | Processes: GPU Memory |
# | GPU PID Type Process name Usage |
# |=============================================================================|
# | No running processes found |
# +-----------------------------------------------------------------------------+
//Start the X Server, press Enter to come to the command line
# Start the X Server, press Enter to come back to the command line
//Check if Xorg process is running
//You will have a list of processes running on the GPU, Xorg should be in the list.
# Check if Xorg process is running
# You will have a list of processes running on the GPU, Xorg should be in the list.
//Make the ubuntu use X Server for display
# Make the ubuntu use X Server for display
$ export DISPLAY=:0
```

//For more information on glxgears, see ftp://www.x.org/pub/X11R6.8.1/doc/glxgears.1.html.
# For more information on glxgears, see ftp://www.x.org/pub/X11R6.8.1/doc/glxgears.1.html.
//If Xorg is configured correctly, you should see the following message
/*
* Running synchronized to the vertical refresh. The framerate should be
* approximately the same as the monitor refresh rate.
* 137296 frames in 5.0 seconds = 27459.053 FPS
* 141674 frames in 5.0 seconds = 28334.779 FPS
* 141490 frames in 5.0 seconds = 28297.875 FPS
*/
# If Xorg is configured correctly, you should see the following message
# Running synchronized to the vertical refresh. The framerate should be
# approximately the same as the monitor refresh rate.
# 137296 frames in 5.0 seconds = 27459.053 FPS
# 141674 frames in 5.0 seconds = 28334.779 FPS
# 141490 frames in 5.0 seconds = 28297.875 FPS
```
## Training on EC2 instance

2. Open the Build Settings window (menu: File > Build Settings).
3. Select Linux as the Target Platform, and x86_64 as the target architecture.
4. Check Headless Mode (If you haven't setup the X Server).
3. Select Linux as the Target Platform, and x86_64 as the target architecture
(the default x86 currently does not work).
4. Check Headless Mode if you have not setup the X Server. (If you do not use
Headless Mode, you have to setup the X Server to enable training.)
7. Test the instance setup from Python using:
7. Change the permissions of the executable.
```console
chmod +x <your_env>.x86_64
```
8. (Without Headless Mode) Start X Server and use it for display:
```console
# Start the X Server, press Enter to come back to the command line
$ sudo /usr/bin/X :0 &
# Check if Xorg process is running
# You will have a list of processes running on the GPU, Xorg should be in the list.
$ nvidia-smi
# Make the ubuntu use X Server for display
$ export DISPLAY=:0
```
9. Test the instance setup from Python using:
```python
from mlagents.envs import UnityEnvironment

Where `<your_env>` corresponds to the path to your environment executable.
You should receive a message confirming that the environment was loaded successfully.
8. Train the executable
10. Train your models
chmod +x <your_env>.x86_64
mlagents-learn <trainer-config-file> --env=<your_env> --train
```
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