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<div class="section" id="distributed-deep-learning">
<h1>Distributed Deep Learning<a class="headerlink" href="#distributed-deep-learning" title="Permalink to this headline">¶</a></h1>
<p>The following tools are libraries, which provide the communication
functions necessary to perform distributed training. Primarily allReduce
and broadcast functions.</p>
<ul class="simple">
<li>IBM Spectrum MPI: Classic tool for distributed computing. Still
commonly used for distributed deep learning.</li>
<li>NVIDIA NCCL: Nvidia’s gpu-to-gpu communication library. Since NCCL2,
between-node communication is supported.</li>
<li>IBM DDL: Provides a topology-aware all-Reduce. Capable of optimally
dividing communication across hierarchies of fabrics. Utilizes
different communication protocols at different hierarchies. When
WMLCE is installed all related frameworks are comming with IBM DDL
support, you don’t have to compile additional software packages, only
to modify your training scripts to make use of the need distributed
deep learning APIs.</li>
</ul>
<p>Integrations into deep learning frameworks to enable distributed
training is using common communication libraries such as:</p>
<ul class="simple">
<li>TensorFlow Distribution Strategies. Native Tensorflow distribution
methods.</li>
<li>IBM DDL. Provides integrations into common frameworks, including a
Tensorflow operator that integrates IBM DDL with Tensorflow and
similar for Pytorch.</li>
<li>Horovod [Sergeev et al. 2018]. Provides integration libraries into
common frameworks which enable distributed training with common
communication libraries, including. IBM DDL can be used as backend
for Horovod implementation.</li>
</ul>
<p>IBM DDL - Documentation and Tutorial:</p>
<ol class="arabic simple">
<li>IBM <a class="reference external" href="https://www.ibm.com/support/knowledgecenter/SS5SF7_1.6.2/navigation/wmlce_ddltf_tutorial.html" target="_blank">DDL integration with
TensorFlow/Keras</a></li>
<li>IBM <a class="reference external" href="https://www.ibm.com/support/knowledgecenter/SS5SF7_1.6.2/navigation/wmlce_ddlpytorch_tutorial.html" target="_blank">DDL integration with
Pytorch</a></li>
<li>IBM <a class="reference external" href="https://developer.ibm.com/linuxonpower/2018/08/24/distributed-deep-learning-horovod-powerai-ddl/" target="_blank">DDL integration with
Horovod</a></li>
<li>IBM <a class="reference external" href="https://www.ibm.com/support/knowledgecenter/SS5SF7_1.6.2/navigation/wmlce_ddlapi.html" target="_blank">DDL
APIs</a>
for a better integration</li>
</ol>
<p>Examples:</p>
<ul class="simple">
<li><a class="reference external" href="https://github.com/IBM/powerai/tree/master/examples/tensorflow_large_model_support/v2" target="_blank">Keras/TensorFlow</a></li>
<li>Pytorch</li>
</ul>
<p>How to get Horovod with DDL? follow bellow instructions (optional 0 - 2 if you have already install WMLCE):</p>
<ol class="arabic simple" start="0">
<li>Add ppc64le conda channel for WMLCE</li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>conda config --prepend channels <span class="se">\</span>
https://public.dhe.ibm.com/ibmdl/export/pub/software/server/ibm-ai/conda/
</pre></div>
</div>
<ol class="arabic simple">
<li>Create Conda Virtual Environment</li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>conda create --name horovod <span class="nv">python</span><span class="o">=</span><span class="m">3</span>.6
</pre></div>
</div>
<ol class="arabic simple" start="2">
<li>Install WMLCE (TF, Pytorch, DDL etc)</li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>conda install powerai
</pre></div>
</div>
<ol class="arabic simple" start="3">
<li>Install the packages to build Horovod</li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>conda install gxx_linux-ppc64le<span class="o">=</span><span class="m">7</span>.3.0 cffi cudatoolkit-dev
</pre></div>
</div>
<ol class="arabic simple" start="4">
<li>Install Horovod with DDL backend</li>
</ol>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nv">HOROVOD_CUDA_HOME</span><span class="o">=</span><span class="nv">$CONDA_PREFIX</span> <span class="nv">HOROVOD_GPU_ALLREDUCE</span><span class="o">=</span>DDL pip install horovod --no-cache-dir
</pre></div>
</div>
<p>or with NCCL direct support (recomanded for Pytorch)</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>env <span class="nv">HOROVOD_CUDA_HOME</span><span class="o">=</span><span class="nv">$CONDA_PREFIX</span> <span class="nv">HOROVOD_NCCL_HOME</span><span class="o">=</span><span class="nv">$CONDA_PREFIX</span> <span class="nv">HOROVOD_GPU_ALLREDUCE</span><span class="o">=</span>NCCL <span class="nv">HOROVOD_GPU_BROADCAST</span><span class="o">=</span>NCCL pip install --no-cache horovod
</pre></div>
</div>
<p>Original IBM DDL paper, can be found at this URL:
<a class="reference external" href="https://arxiv.org/pdf/1708.02188.pdf" target="_blank">https://arxiv.org/pdf/1708.02188.pdf</a></p>
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