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    <li>Submit a Distributed Training Job</li>
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  <div class="section" id="submit-a-distributed-training-job">
<span id="submit-a-distributed-training-job"></span><h1>Submit a Distributed Training Job<a class="headerlink" href="#submit-a-distributed-training-job" title="Permalink to this headline"></a></h1>
<p>The user can submit a distributed training job with Python code, rather than with a command-line interface.</p>
<div class="section" id="runtime-environment-on-kubernetes">
<span id="runtime-environment-on-kubernetes"></span><h2>Runtime Environment On Kubernetes<a class="headerlink" href="#runtime-environment-on-kubernetes" title="Permalink to this headline"></a></h2>
<p>For a distributed training job, there is two Docker image called <em>runtime Docker image</em> and <em>base Docker image</em>. The runtime Docker image is the Docker image that gets scheduled by Kubernetes to run during training. The base Docker image is for building the runtime Docker image.</p>
<div class="section" id="base-docker-image">
<span id="base-docker-image"></span><h3>Base Docker Image<a class="headerlink" href="#base-docker-image" title="Permalink to this headline"></a></h3>
<p>Usually, the base Docker image is PaddlePaddle product Docker image including paddle binary files and python package. And of course, users can specify any image name hosted on any docker registry which users have the access right.</p>
</div>
<div class="section" id="runtime-docker-image">
<span id="runtime-docker-image"></span><h3>Runtime Docker Image<a class="headerlink" href="#runtime-docker-image" title="Permalink to this headline"></a></h3>
<p>The trainer package which user upload and some Python dependencies are packaged into a runtime Docker image based on base Docker image.</p>
<ul>
<li><p class="first">Handle Python Dependencies</p>
<p>You need to provide requirements.txt file in your <code class="docutils literal"><span class="pre">trainer-package</span></code> folder. Example:</p>
<div class="highlight-txt"><div class="highlight"><pre><span></span>pillow
protobuf==3.1.0
</pre></div>
</div>
<p>More <a class="reference external" href="https://pip.readthedocs.io/en/1.1/requirements.html">details</a> about requirements, an example project looks like:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>  paddle_example
    <span class="p">|</span>-quick_start
      <span class="p">|</span>-trainer.py
      <span class="p">|</span>-dataset.py
      <span class="p">|</span>-requirements.txt
</pre></div>
</div>
</li>
</ul>
</div>
</div>
<div class="section" id="submit-distributed-training-job-with-python-code">
<span id="submit-distributed-training-job-with-python-code"></span><h2>Submit Distributed Training Job With Python Code<a class="headerlink" href="#submit-distributed-training-job-with-python-code" title="Permalink to this headline"></a></h2>
<p><img src="./src/submit-job.png" width="800"></p>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">paddle.job.dist_train()</span></code> will call the Job Server API <code class="docutils literal"><span class="pre">/v1/packages</span></code> to upload the trainer package and save them on CephFS, and then call <code class="docutils literal"><span class="pre">/v1/trainer/job</span></code> to submit the PaddlePaddle distributed job.</li>
<li><code class="docutils literal"><span class="pre">/v1/trainer/job</span></code> will start a building job for preparing the runtime Docker image. When the building job is finished, Job Server will submit the PaddlePaddle distributed job to Kubernetes.</li>
<li><em>NOTE</em>: For the first version, we will not prepare the runtime Docker image, instead, the package is uploaded to Paddle Cloud, and Paddle Cloud will mount the package in a temporary folder into the base Docker image. We will not support custom Python dependencies in the first version as well.</li>
</ul>
<p>You can call <code class="docutils literal"><span class="pre">paddle.job.dist_train</span></code> and provide distributed training configuration as the parameters:</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">paddle</span><span class="o">.</span><span class="n">job</span><span class="o">.</span><span class="n">dist_train</span><span class="p">(</span>
  <span class="n">trainer</span><span class="o">=</span><span class="n">dist_trainer</span><span class="p">(),</span>
  <span class="n">paddle_job</span><span class="o">=</span><span class="n">PaddleJob</span><span class="p">(</span>
    <span class="n">job_name</span> <span class="o">=</span> <span class="s2">&quot;paddle-cloud&quot;</span><span class="p">,</span>
    <span class="n">entry_point</span> <span class="o">=</span> <span class="s2">&quot;python </span><span class="si">%s</span><span class="s2">&quot;</span><span class="o">%</span><span class="vm">__file__</span><span class="p">,</span>
    <span class="n">trainer_package</span> <span class="o">=</span> <span class="s2">&quot;/example/word2vec&quot;</span><span class="p">,</span>
    <span class="n">image</span> <span class="o">=</span> <span class="s2">&quot;yancey1989/paddle-job&quot;</span><span class="p">,</span>
    <span class="n">trainers</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span>
    <span class="n">pservers</span> <span class="o">=</span> <span class="mi">3</span><span class="p">,</span>
    <span class="n">trainer_cpu</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
    <span class="n">trainer_gpu</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
    <span class="n">trainer_mem</span> <span class="o">=</span> <span class="s2">&quot;10G&quot;</span><span class="p">,</span>
    <span class="n">pserver_cpu</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>
    <span class="n">pserver_mem</span> <span class="o">=</span> <span class="s2">&quot;2G&quot;</span>
  <span class="p">))</span>
</pre></div>
</div>
<p>The parameter <code class="docutils literal"><span class="pre">trainer</span></code> of <code class="docutils literal"><span class="pre">paddle.job.dist_train</span></code> is a function and you can implement it as follows:</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">dist_trainer</span><span class="p">():</span>
  <span class="k">def</span> <span class="nf">trainer_creator</span><span class="p">():</span>
    <span class="n">trainer</span> <span class="o">=</span> <span class="n">paddle</span><span class="o">.</span><span class="n">v2</span><span class="o">.</span><span class="n">trainer</span><span class="o">.</span><span class="n">SGD</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
    <span class="n">trainer</span><span class="o">.</span><span class="n">train</span><span class="p">(</span><span class="o">...</span><span class="p">)</span>
  <span class="k">return</span> <span class="n">trainer_creator</span>
</pre></div>
</div>
<p>The pseudo code of <code class="docutils literal"><span class="pre">paddle.job.dist_train</span></code> is as follows:</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">dist_train</span><span class="p">(</span><span class="n">trainer</span><span class="p">,</span> <span class="n">paddle_job</span><span class="p">):</span>
  <span class="c1"># if the code is running on cloud, set PADDLE_ON_CLOUD=YES</span>
  <span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">getenv</span><span class="p">(</span><span class="s2">&quot;RUNNING_ON_CLOUD&quot;</span><span class="p">,</span> <span class="s2">&quot;NO&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="s2">&quot;NO&quot;</span><span class="p">:</span>
    <span class="c1">#submit the paddle job</span>
    <span class="n">paddle_job</span><span class="o">.</span><span class="n">submit</span><span class="p">()</span>
  <span class="k">else</span><span class="p">:</span>
    <span class="c1">#start the training</span>
    <span class="n">trainer</span><span class="p">()</span>
</pre></div>
</div>
<div class="section" id="paddlejob-parameters">
<span id="paddlejob-parameters"></span><h3>PaddleJob Parameters<a class="headerlink" href="#paddlejob-parameters" title="Permalink to this headline"></a></h3>
<p>parameter | type | explanation
&#8212; | &#8212; | &#8212;
job_name | str | the unique name for the training job
entry_point | str | entry point for startup trainer process
trainer_package | str | trainer package file path which user have the access right
image|str|the <a class="reference external" href="#base-docker-image">base image</a> for building the <a class="reference external" href="#runtime-docker-image">runtime image</a>
pservers|int| Parameter Server process count
trainers|int| Trainer process count
pserver_cpu|int| CPU count for each Parameter Server process
pserver_mem|str| memory allocated for each Parameter Server process, a plain integer using one of these suffixes: E, P, T, G, M, K
trainer_cpu|int| CPU count for each Trainer process
trainer_mem|str| memory allocated for each Trainer process, a plain integer using one of these suffixes: E, P, T, G, M, K
trainer_gpu|int| GPU count for each Trainer process, if you only want CPU, do not set this parameter</p>
</div>
<div class="section" id="deploy-parameter-server-trainer-and-master-process">
<span id="deploy-parameter-server-trainer-and-master-process"></span><h3>Deploy Parameter Server, Trainer and Master Process<a class="headerlink" href="#deploy-parameter-server-trainer-and-master-process" title="Permalink to this headline"></a></h3>
<ul class="simple">
<li>Deploy PaddlePaddle Parameter Server processes, it&#8217;s a Kubernetes ReplicaSet.</li>
<li>Deploy PaddlePaddle Trainer processes, it&#8217;s a Kubernetes Job.</li>
<li>Deploy PaddlePaddle Master processes, it&#8217;s a Kubernetes ReplicaSet.</li>
</ul>
</div>
</div>
<div class="section" id="job-server">
<span id="job-server"></span><h2>Job Server<a class="headerlink" href="#job-server" title="Permalink to this headline"></a></h2>
<ul>
<li><p class="first">RESTful API</p>
<p>Job server provides RESTful HTTP API for receiving the trainer package and displaying
PaddlePaddle job related informations.</p>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">POST</span> <span class="pre">/v1/package</span></code> receive the trainer package and save them on CephFS</li>
<li><code class="docutils literal"><span class="pre">POST</span> <span class="pre">/v1/trainer/job</span></code> submit a trainer job</li>
<li><code class="docutils literal"><span class="pre">GET</span> <span class="pre">/v1/jobs/</span></code> list all jobs</li>
<li><code class="docutils literal"><span class="pre">GET</span> <span class="pre">/v1/jobs/&lt;job-name&gt;</span></code> the status of a job</li>
<li><code class="docutils literal"><span class="pre">DELETE</span> <span class="pre">/v1/jobs/&lt;job-name&gt;</span></code> delete a job</li>
<li><code class="docutils literal"><span class="pre">GET</span> <span class="pre">/v1/version</span></code> job server version</li>
</ul>
</li>
<li><p class="first">Build Runtime Docker Image on Kubernetes</p>
<p><code class="docutils literal"><span class="pre">paddle.job.dist_train</span></code> will upload the trainer package to Job Server, save them on the distributed filesystem, and then start up a job for building the runtime Docker image that gets scheduled by Kubernetes to run during training.</p>
<p>There are some benefits for building runtime Docker image on JobServer:</p>
<ul class="simple">
<li>On Paddle Cloud, users will run the trainer code in a Jupyter Notebook which is a Kubernetes Pod, if we want to execute <code class="docutils literal"><span class="pre">docker</span> <span class="pre">build</span></code> in the Pod, we should mount the host&#8217;s <code class="docutils literal"><span class="pre">docker.sock</span></code> to the Pod, user&#8217;s code will connect the host&#8217;s Docker Engine directly, it&#8217;s not safe.</li>
<li>Users only need to upload the training package files, does not need to install docker engine, docker registry as dependencies.</li>
<li>If we want to change another image type, such as RKT, users do not need to care about it.</li>
</ul>
</li>
<li><p class="first">Deploy Parameter Server, Trainer and Master Processes</p>
<p><code class="docutils literal"><span class="pre">POST</span> <span class="pre">/v1/trainer/job</span></code> receives the distributed training parameters, and deploy the job as follows:</p>
<ul class="simple">
<li>Deploy PaddlePaddle Parameter Server processes, it&#8217;s a Kubernetes ReplicaSet.</li>
<li>Deploy PaddlePaddle Trainer processes, it&#8217;s a Kubernetes Job.</li>
<li>Deploy PaddlePaddle Master processes, it&#8217;s a Kubernetes ReplicaSet.</li>
</ul>
</li>
</ul>
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