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Old engine for Continuous Time Bayesian Networks. Superseded by reCTBN. 🐍 https://github.com/madlabunimib/PyCTBN
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<li class="toctree-l2"><a class="reference internal" href="#parameters-estimation-example">Parameters Estimation Example</a></li>
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<div class="section" id="examples">
<h1>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h1>
<div class="section" id="installation-usage">
<h2>Installation/Usage<a class="headerlink" href="#installation-usage" title="Permalink to this headline"></a></h2>
<p>Download the release in .tar.gz or .whl format and simply use pip install to install it:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$pip install PyCTBN-1.0.tar.gz
</pre></div>
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<div class="section" id="implementing-your-own-data-importer">
<h2>Implementing your own data importer<a class="headerlink" href="#implementing-your-own-data-importer" title="Permalink to this headline"></a></h2>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="sd">&quot;&quot;&quot;This example demonstrates the implementation of a simple data importer the extends the class abstract importer to import data in csv format.</span>
<span class="sd">The net in exam has three ternary nodes and no prior net structure.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">AbstractImporter</span>
<span class="k">class</span> <span class="nc">CSVImporter</span><span class="p">(</span><span class="n">AbstractImporter</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">file_path</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_df_samples_list</span> <span class="o">=</span> <span class="kc">None</span>
<span class="nb">super</span><span class="p">(</span><span class="n">CSVImporter</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">file_path</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">import_data</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">read_csv_file</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_sorter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">build_sorter</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_df_samples_list</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
<span class="bp">self</span><span class="o">.</span><span class="n">import_variables</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">compute_row_delta_in_all_samples_frames</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_df_samples_list</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">read_csv_file</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">df</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">read_csv</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_file_path</span><span class="p">)</span>
<span class="n">df</span><span class="o">.</span><span class="n">drop</span><span class="p">(</span><span class="n">df</span><span class="o">.</span><span class="n">columns</span><span class="p">[[</span><span class="mi">0</span><span class="p">]],</span> <span class="n">axis</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">inplace</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_df_samples_list</span> <span class="o">=</span> <span class="p">[</span><span class="n">df</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">import_variables</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">values_list</span> <span class="o">=</span> <span class="p">[</span><span class="mi">3</span> <span class="k">for</span> <span class="n">var</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sorter</span><span class="p">]</span>
<span class="c1"># initialize dict of lists</span>
<span class="n">data</span> <span class="o">=</span> <span class="p">{</span><span class="s1">&#39;Name&#39;</span><span class="p">:</span><span class="bp">self</span><span class="o">.</span><span class="n">_sorter</span><span class="p">,</span> <span class="s1">&#39;Value&#39;</span><span class="p">:</span><span class="n">values_list</span><span class="p">}</span>
<span class="c1"># Create the pandas DataFrame</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_df_variables</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">DataFrame</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">build_sorter</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sample_frame</span><span class="p">:</span> <span class="n">pd</span><span class="o">.</span><span class="n">DataFrame</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">typing</span><span class="o">.</span><span class="n">List</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="n">sample_frame</span><span class="o">.</span><span class="n">columns</span><span class="p">)[</span><span class="mi">1</span><span class="p">:]</span>
<span class="k">def</span> <span class="nf">dataset_id</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">object</span><span class="p">:</span>
<span class="k">pass</span>
</pre></div>
</div>
</div>
<div class="section" id="parameters-estimation-example">
<h2>Parameters Estimation Example<a class="headerlink" href="#parameters-estimation-example" title="Permalink to this headline"></a></h2>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">JsonImporter</span>
<span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">SamplePath</span>
<span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">NetworkGraph</span>
<span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">ParametersEstimator</span>
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
<span class="n">read_files</span> <span class="o">=</span> <span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">&#39;./data&#39;</span><span class="p">,</span> <span class="s2">&quot;*.json&quot;</span><span class="p">))</span> <span class="c1">#Take all json files in this dir</span>
<span class="c1">#import data</span>
<span class="n">importer</span> <span class="o">=</span> <span class="n">JsonImporter</span><span class="p">(</span><span class="n">read_files</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="s1">&#39;samples&#39;</span><span class="p">,</span> <span class="s1">&#39;dyn.str&#39;</span><span class="p">,</span> <span class="s1">&#39;variables&#39;</span><span class="p">,</span> <span class="s1">&#39;Time&#39;</span><span class="p">,</span> <span class="s1">&#39;Name&#39;</span><span class="p">)</span>
<span class="n">importer</span><span class="o">.</span><span class="n">import_data</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="c1">#Create a SamplePath Obj passing an already filled AbstractImporter object</span>
<span class="n">s1</span> <span class="o">=</span> <span class="n">SamplePath</span><span class="p">(</span><span class="n">importer</span><span class="p">)</span>
<span class="c1">#Build The trajectries and the structural infos</span>
<span class="n">s1</span><span class="o">.</span><span class="n">build_trajectories</span><span class="p">()</span>
<span class="n">s1</span><span class="o">.</span><span class="n">build_structure</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="n">s1</span><span class="o">.</span><span class="n">structure</span><span class="o">.</span><span class="n">edges</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">s1</span><span class="o">.</span><span class="n">structure</span><span class="o">.</span><span class="n">nodes_values</span><span class="p">)</span>
<span class="c1">#From The Structure Object build the Graph</span>
<span class="n">g</span> <span class="o">=</span> <span class="n">NetworkGraph</span><span class="p">(</span><span class="n">s1</span><span class="o">.</span><span class="n">structure</span><span class="p">)</span>
<span class="c1">#Select a node you want to estimate the parameters</span>
<span class="n">node</span> <span class="o">=</span> <span class="n">g</span><span class="o">.</span><span class="n">nodes</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Node&quot;</span><span class="p">,</span> <span class="n">node</span><span class="p">)</span>
<span class="c1">#Init the _graph specifically for THIS node</span>
<span class="n">g</span><span class="o">.</span><span class="n">fast_init</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
<span class="c1">#Use SamplePath and Grpah to create a ParametersEstimator Object</span>
<span class="n">p1</span> <span class="o">=</span> <span class="n">ParametersEstimator</span><span class="p">(</span><span class="n">s1</span><span class="o">.</span><span class="n">trajectories</span><span class="p">,</span> <span class="n">g</span><span class="p">)</span>
<span class="c1">#Init the peEst specifically for THIS node</span>
<span class="n">p1</span><span class="o">.</span><span class="n">fast_init</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
<span class="c1">#Compute the parameters</span>
<span class="n">sofc1</span> <span class="o">=</span> <span class="n">p1</span><span class="o">.</span><span class="n">compute_parameters_for_node</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
<span class="c1">#The est CIMS are inside the resultant SetOfCIms Obj</span>
<span class="nb">print</span><span class="p">(</span><span class="n">sofc1</span><span class="o">.</span><span class="n">actual_cims</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="structure-estimation-example">
<h2>Structure Estimation Example<a class="headerlink" href="#structure-estimation-example" title="Permalink to this headline"></a></h2>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">JsonImporter</span>
<span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">SamplePath</span>
<span class="kn">from</span> <span class="nn">PyCTBN</span> <span class="kn">import</span> <span class="n">StructureEstimator</span>
<span class="k">def</span> <span class="nf">structure_estimation_example</span><span class="p">():</span>
<span class="c1"># read the json files in ./data path</span>
<span class="n">read_files</span> <span class="o">=</span> <span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="s1">&#39;./data&#39;</span><span class="p">,</span> <span class="s2">&quot;*.json&quot;</span><span class="p">))</span>
<span class="c1"># initialize a JsonImporter object for the first file</span>
<span class="n">importer</span> <span class="o">=</span> <span class="n">JsonImporter</span><span class="p">(</span><span class="n">read_files</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="s1">&#39;samples&#39;</span><span class="p">,</span> <span class="s1">&#39;dyn.str&#39;</span><span class="p">,</span> <span class="s1">&#39;variables&#39;</span><span class="p">,</span> <span class="s1">&#39;Time&#39;</span><span class="p">,</span> <span class="s1">&#39;Name&#39;</span><span class="p">)</span>
<span class="c1"># import the data at index 0 of the outer json array</span>
<span class="n">importer</span><span class="o">.</span><span class="n">import_data</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="c1"># construct a SamplePath Object passing a filled AbstractImporter</span>
<span class="n">s1</span> <span class="o">=</span> <span class="n">SamplePath</span><span class="p">(</span><span class="n">importer</span><span class="p">)</span>
<span class="c1"># build the trajectories</span>
<span class="n">s1</span><span class="o">.</span><span class="n">build_trajectories</span><span class="p">()</span>
<span class="c1"># build the real structure</span>
<span class="n">s1</span><span class="o">.</span><span class="n">build_structure</span><span class="p">()</span>
<span class="c1"># construct a StructureEstimator object</span>
<span class="n">se1</span> <span class="o">=</span> <span class="n">StructureEstimator</span><span class="p">(</span><span class="n">s1</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">)</span>
<span class="c1"># call the ctpc algorithm</span>
<span class="n">se1</span><span class="o">.</span><span class="n">ctpc_algorithm</span><span class="p">()</span>
<span class="c1"># the adjacency matrix of the estimated structure</span>
<span class="nb">print</span><span class="p">(</span><span class="n">se1</span><span class="o">.</span><span class="n">adjacency_matrix</span><span class="p">())</span>
<span class="c1"># save results to a json file</span>
<span class="n">se1</span><span class="o">.</span><span class="n">save_results</span><span class="p">()</span>
</pre></div>
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