Distributed Training using TensorFlow Federated

This is a very simple example of using multiple GPUs using a Jupyter Notebook to train a model. Obviously this involves multiple machines or VMs or in this case multiple processes in a simple Compute instance. Multiple processes in a single VM make it easier to test.

GPUs seem to be a costly affair.

I connected using SSH and these are the details of the VM

======================================
Welcome to the Google Deep Learning VM
======================================

Version: tf2-gpu.2-8.m92
Based on: Debian GNU/Linux 10 (buster) (GNU/Linux 4.19.0-20-cloud-amd64 x86_64\n)

Resources:
 * Google Deep Learning Platform StackOverflow: https://stackoverflow.com/questions/tagged/google-dl-platform
 * Google Cloud Documentation: https://cloud.google.com/deep-learning-vm
 * Google Group: https://groups.google.com/forum/#!forum/google-dl-platform

To reinstall Nvidia driver (if needed) run:
sudo /opt/deeplearning/install-driver.sh
TensorFlow comes pre-installed with this image. To install TensorFlow binaries in a virtualenv (or conda env),
please use the binaries that are pre-built for this image. You can find the binaries at
/opt/deeplearning/binaries/tensorflow/
If you need to install a different version of Tensorflow manually, use the common Deep Learning image with the
right version of CUDA

Linux distributedtraining 4.19.0-20-cloud-amd64 #1 SMP Debian 4.19.235-1 (2022-03-17) x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.


(base) root@distributedtraining:~# nvidia-smi
Wed May 25 04:59:48 2022       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 470.57.02    Driver Version: 470.57.02    CUDA Version: 11.4     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  Tesla T4            Off  | 00000000:00:04.0 Off |                    0 |
| N/A   64C    P0    29W /  70W |      0MiB / 15109MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
|   1  Tesla T4            Off  | 00000000:00:05.0 Off |                    0 |
| N/A   59C    P0    30W /  70W |      0MiB / 15109MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|  No running processes found                                                 |
+-----------------------------------------------------------------------------+

Build Jupyter

Since my automatic build failed I built myself. Not sure why it should fail.

radhakrishnan_mohan@distributedtraining:~$ sudo -i
(base) root@distributedtraining:~# jupyter lab build --dev-build=False --minimize=False
[LabBuildApp] JupyterLab 3.2.9
[LabBuildApp] Building in /opt/conda/share/jupyter/lab
[LabBuildApp] Building jupyterlab assets (production, not minimized)
(base) root@distributedtraining:~# jupyter labextension list
JupyterLab v3.2.9
/opt/conda/share/jupyter/labextensions
        nbdime-jupyterlab v2.1.1 enabled OK
        jupyterlab-jupytext v1.3.8+dev enabled OK (python, jupytext)
        jupyterlab_pygments v0.2.2 enabled OK (python, jupyterlab_pygments)
        @jupyterlab/server-proxy v3.2.1 enabled OK
        @jupyterlab/git v0.37.1 enabled OK (python, jupyterlab-git)
        @jupyter-widgets/jupyterlab-manager v3.1.0 enabled OK (python, jupyterlab_widgets)

Other labextensions (built into JupyterLab)
   app dir: /opt/conda/share/jupyter/lab
        beatrix_jupyterlab v3.1.7 disabled OK
        jupyterlab-plotly v5.8.0 enabled OK
        plotlywidget v4.14.3 enabled OK
        tensorflow_model_analysis v0.34.1 enabled OK
        wit-widget v1.8.1 enabled OK
        xai_tabular_widget v0.1.0 enabled OK

Assign GPU device to worker

It seems that it is imperative to assign a particular GPU to a worker as we have 2 Tesla P4 GPUs and 2 workers. If we don’t then there is failure to allocate GPU memory adequately. This line of code does that.

os.environ['CUDA_VISIBLE_DEVICES']=str(index)

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