Skip to content

Recommended CNTK 2.0 Setup

Jump to bottom
sayanpa edited this page Oct 25, 2016 · 29 revisions

CNTK V2 Setup and Installation

You can install CNTK with in three different ways on Windows and Linux :

[Note: The CNTK new Python and C++ APIs are an alpha release for early users to try and provide feedback on the usability and functional aspects of the API. Use of CNTK as an exe with BrainScript is not alpha, and in production]

Language Support:

CNTK can act as a library and provides Python and C++ APIs. Additionally, CNTK can be used as a standalone exe with BrainScript. When CNTK is used a library, these APIs enables programmatically defining CNTK models and drive their training/evaluation, using either built-in data readers or user supplied data in native Python numpy/C++ arrays.

  • Python:
    • CNTK with Python APIs is supported natively on Windows with Python 3.4.4 and on Linux with Python 3.5. For both the platforms one can create a 3.4.4 python environment within any Anaconda (Python 2.7 or 3.x version).
  • Brainscript:
    • CNTK also supports the BrainScript framework.

Binary installation with scripts (recommended)

Please follow the links for:

Note: The script installs a CNTK Python 3.4 environment with Anaconda 4.1.1 located at $HOME/anaconda3/envs/cntk-py34 with all packages required for CNTK v2 Python and notebooks.

Installation steps for Windows

Please follow the steps below to install the binaries. The installation script will additionally download the necessary dependencies and clone the CNTK repository, so Internet connection is required when running the script.

Step 1: Download the appropriate binary package from UPDATE PATH CNTK Releases page. Unpack the zip file into a local folder (say c:\local\).

Step 2: Prepare to run PowerShell scripts:

  • Open PowerShell with administrator priviledges
  • Click on Windows Start
  • Search for Windows PowerShell (see below), Right click on the icon and select Run as administrator

  • Type and run: set-executionpolicy -executionpolicy unrestricted. Upon being prompted, select A

  • Close the PowerShell window
  • Start a new Windows PowerShell application similar to previous step (not in Administrator mode )

Step 2: Run PowerShell Installation script

Below we assume that you have unzipped the CNTK Binary package to c:\local\.

  • Run:
cd c:\local\cntk\Scripts\windows
.\install.ps1

The script will tell you what changes it is about to do on your machine and will emulate the installation steps. No actual changes will be done to your machine at this point.

If you are satisfied with the proposed changes, proceed to the actual installation. We recommend closing all running programs to avoid conflicts with the different installation procedures to be executed. Start the installation by running:

.\install.ps1 -execute

IMPORTANT! Expect multiple prompts from UAC (User Account Control) asking your agreement to run certain installation programs.

Because the script needs to download some installation packages from remote locations expect, that running it will take some time (expect at least 20 minutes if none of the required per-requisites are detected on your system).

By the end of the successful setup the script will inform you about the location of the CNTK Python environment batch file and of the location of CNTK Python examples.

Step 3: Verify the setup (Python)

Open command prompt and activate CNTK Python environment by executing the batch file specified by the Installation script (see previous step). In our example it will be:

C:\local\cntk\scripts\cntkpy34.bat

Run the following commands:

cd c:\repos\CNTK\bindings\python
python examples/NumpyInterop/feedforwardNet.py

If everything works correct you should get a console output like the one below:

Minibatch: 0, Train Loss: 0.6915470886230469, Train Evaluation Criterion: 0.52
Minibatch: 60, Train Loss: 0.6610990142822266, Train Evaluation Criterion: 0.56
Minibatch: 120, Train Loss: 0.31225751876831054, Train Evaluation Criterion: 0.2
Minibatch: 180, Train Loss: 0.1848754119873047, Train Evaluation Criterion: 0.08
Minibatch: 240, Train Loss: 0.19827106475830078, Train Evaluation Criterion: 0.08
Minibatch: 300, Train Loss: 0.16531991958618164, Train Evaluation Criterion: 0.04
Minibatch: 360, Train Loss: 0.8258456420898438, Train Evaluation Criterion: 0.28
Minibatch: 420, Train Loss: 0.31327741622924804, Train Evaluation Criterion: 0.16
Minibatch: 480, Train Loss: 0.14627487182617188, Train Evaluation Criterion: 0.04
Minibatch: 540, Train Loss: 0.19005121231079103, Train Evaluation Criterion: 0.12
Minibatch: 600, Train Loss: 0.15139059066772462, Train Evaluation Criterion: 0.04
Minibatch: 660, Train Loss: 0.10627300262451173, Train Evaluation Criterion: 0.04
Minibatch: 720, Train Loss: 0.33113689422607423, Train Evaluation Criterion: 0.12
Minibatch: 780, Train Loss: 0.3315776443481445, Train Evaluation Criterion: 0.12
Error: 0.120000

Step 4 (Optional): Verify the setup (BrainScript)

Perform the following command in the CNTK Python environment command prompt (see previous step):

cd C:\repos\CNTK\Examples\Other\Simple2d\Data
  • Testing with CPU: Run the following command
cntk configFile=../Config/Simple.cntk makeMode= false 1> out.txt 2>&1

Look for the string Builder Using in the resulting file out.txt. You should be able to find this line:

SimpleNetworkBuilder Using CPU
  • Testing with GPU: Run the following command
cntk configFile=../Config/Simple.cntk deviceId=auto makeMode= false 1> out.txt 2>&1

Look for the string Builder Using in the resulting file out.txt. You should be able to find a line like this:

SimpleNetworkBuilder Using GPU 0

Installation steps for Linux

Please follow the steps below to install the binaries. The script will additionally clone the CNTK repository into /home/[USERNAME]/repos/cntk. Note: we have tested the script on Ubuntu 16.0.4. We first summarize what the script installs for you and sets the environment variables.

Step 1: Prepare to run scripts:

  • Download the appropriate binary package from POINT TO RELEASE DIR CNTK Releases page to /home/[USERNAME]/local/ . Unpack the release package tar.gz archive at this location using the command: tar xvfz [CNTK release tar.gz package]

Step 2: Run bash scripts:

cd /home/[USERNAME]/local/cntk
bash Scripts/linux/install-cntk.sh

Step 3: Install Python updates

  • RUN: source /home/[USERNAME]/local/cntk/activate-cntk to activate the CNTK environment.

  • If you want to deploy a new CNTK wheel package at a later time simply re-run: pip install –upgrade /home/[USERNAME]/local/CNTK/CNTK/Python/[Whl file location]

Step 4: Verify setup

  • Python

    • Change to where the examples are located and run the python script:
cd c:\repos\CNTK\bindings\python\examples\NumpyInterop

python FeedForwardNet.py

A successful implementation should run the python example and you should be able to see output in the console.

Minibatch: 0, Train Loss: 0.7915553283691407, Train Evaluation Criterion: 0.48

Minibatch: 20, Train Loss: 0.6266774368286133, Train Evaluation Criterion: 0.48

Minibatch: 40, Train Loss: 1.0378565979003906, Train Evaluation Criterion: 0.64

Minibatch: 60, Train Loss: 0.6558118438720704, Train Evaluation Criterion: 0.56

  • Brainscript (optional)

    • Please run the following self contained example:
cd C:\repos\CNTK\Examples\Other\Simple2d

cntk configFile=Config/Simple.cntk currentDirectory=Data

You should be able to see the results getting printed on the console.

New Documentation Site

Iteration Plans

Clone this wiki locally