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<!DOCTYPE html>
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<title>arrayfire.device — ArrayFire Python documentation</title>
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<h1>Source code for arrayfire.device</h1><div class="highlight"><pre>
<span></span><span class="c1">#######################################################</span>
<span class="c1"># Copyright (c) 2015, ArrayFire</span>
<span class="c1"># All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># This file is distributed under 3-clause BSD license.</span>
<span class="c1"># The complete license agreement can be obtained at:</span>
<span class="c1"># http://arrayfire.com/licenses/BSD-3-Clause</span>
<span class="c1">########################################################</span>
<span class="sd">"""</span>
<span class="sd">Functions to handle the available devices in the backend.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">.library</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.util</span> <span class="kn">import</span> <span class="p">(</span><span class="n">safe_call</span><span class="p">,</span> <span class="n">to_str</span><span class="p">,</span> <span class="n">get_version</span><span class="p">)</span>
<div class="viewcode-block" id="init"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.init">[docs]</a><span class="k">def</span> <span class="nf">init</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Note</span>
<span class="sd"> -----</span>
<span class="sd"> This function may need to be called when interoperating with other libraries</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_init</span><span class="p">())</span></div>
<div class="viewcode-block" id="info"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.info">[docs]</a><span class="k">def</span> <span class="nf">info</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Displays the information about the following:</span>
<span class="sd"> - ArrayFire build and version number.</span>
<span class="sd"> - The number of devices available.</span>
<span class="sd"> - The names of the devices.</span>
<span class="sd"> - The current device being used.</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_info</span><span class="p">())</span></div>
<div class="viewcode-block" id="device_info"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.device_info">[docs]</a><span class="k">def</span> <span class="nf">device_info</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Returns a map with the following fields:</span>
<span class="sd"> - 'device': Name of the current device.</span>
<span class="sd"> - 'backend': The current backend being used.</span>
<span class="sd"> - 'toolkit': The toolkit version for the backend.</span>
<span class="sd"> - 'compute': The compute version of the device.</span>
<span class="sd"> """</span>
<span class="n">c_char_256</span> <span class="o">=</span> <span class="n">c_char_t</span> <span class="o">*</span> <span class="mi">256</span>
<span class="n">device_name</span> <span class="o">=</span> <span class="n">c_char_256</span><span class="p">()</span>
<span class="n">backend_name</span> <span class="o">=</span> <span class="n">c_char_256</span><span class="p">()</span>
<span class="n">toolkit</span> <span class="o">=</span> <span class="n">c_char_256</span><span class="p">()</span>
<span class="n">compute</span> <span class="o">=</span> <span class="n">c_char_256</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_device_info</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">device_name</span><span class="p">),</span> <span class="n">c_pointer</span><span class="p">(</span><span class="n">backend_name</span><span class="p">),</span>
<span class="n">c_pointer</span><span class="p">(</span><span class="n">toolkit</span><span class="p">),</span> <span class="n">c_pointer</span><span class="p">(</span><span class="n">compute</span><span class="p">)))</span>
<span class="n">dev_info</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">dev_info</span><span class="p">[</span><span class="s1">'device'</span><span class="p">]</span> <span class="o">=</span> <span class="n">to_str</span><span class="p">(</span><span class="n">device_name</span><span class="p">)</span>
<span class="n">dev_info</span><span class="p">[</span><span class="s1">'backend'</span><span class="p">]</span> <span class="o">=</span> <span class="n">to_str</span><span class="p">(</span><span class="n">backend_name</span><span class="p">)</span>
<span class="n">dev_info</span><span class="p">[</span><span class="s1">'toolkit'</span><span class="p">]</span> <span class="o">=</span> <span class="n">to_str</span><span class="p">(</span><span class="n">toolkit</span><span class="p">)</span>
<span class="n">dev_info</span><span class="p">[</span><span class="s1">'compute'</span><span class="p">]</span> <span class="o">=</span> <span class="n">to_str</span><span class="p">(</span><span class="n">compute</span><span class="p">)</span>
<span class="k">return</span> <span class="n">dev_info</span></div>
<div class="viewcode-block" id="get_device_count"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.get_device_count">[docs]</a><span class="k">def</span> <span class="nf">get_device_count</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Returns the number of devices available.</span>
<span class="sd"> """</span>
<span class="n">c_num</span> <span class="o">=</span> <span class="n">c_int_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_device_count</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">c_num</span><span class="p">)))</span>
<span class="k">return</span> <span class="n">c_num</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="get_device"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.get_device">[docs]</a><span class="k">def</span> <span class="nf">get_device</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Returns the id of the current device.</span>
<span class="sd"> """</span>
<span class="n">c_dev</span> <span class="o">=</span> <span class="n">c_int_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_device</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">c_dev</span><span class="p">)))</span>
<span class="k">return</span> <span class="n">c_dev</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="set_device"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.set_device">[docs]</a><span class="k">def</span> <span class="nf">set_device</span><span class="p">(</span><span class="n">num</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Change the active device to the specified id.</span>
<span class="sd"> Parameters</span>
<span class="sd"> -----------</span>
<span class="sd"> num: int.</span>
<span class="sd"> id of the desired device.</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_set_device</span><span class="p">(</span><span class="n">num</span><span class="p">))</span></div>
<div class="viewcode-block" id="info_str"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.info_str">[docs]</a><span class="k">def</span> <span class="nf">info_str</span><span class="p">(</span><span class="n">verbose</span> <span class="o">=</span> <span class="kc">False</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns information about the following as a string:</span>
<span class="sd"> - ArrayFire version number.</span>
<span class="sd"> - The number of devices available.</span>
<span class="sd"> - The names of the devices.</span>
<span class="sd"> - The current device being used.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">platform</span>
<span class="n">res_str</span> <span class="o">=</span> <span class="s1">'ArrayFire'</span>
<span class="n">major</span><span class="p">,</span> <span class="n">minor</span><span class="p">,</span> <span class="n">patch</span> <span class="o">=</span> <span class="n">get_version</span><span class="p">()</span>
<span class="n">dev_info</span> <span class="o">=</span> <span class="n">device_info</span><span class="p">()</span>
<span class="n">backend_str</span> <span class="o">=</span> <span class="n">dev_info</span><span class="p">[</span><span class="s1">'backend'</span><span class="p">]</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">' v'</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">major</span><span class="p">)</span> <span class="o">+</span> <span class="s1">'.'</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">minor</span><span class="p">)</span> <span class="o">+</span> <span class="s1">'.'</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">patch</span><span class="p">)</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">' ('</span> <span class="o">+</span> <span class="n">backend_str</span> <span class="o">+</span> <span class="s1">' '</span> <span class="o">+</span> <span class="n">platform</span><span class="o">.</span><span class="n">architecture</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span> <span class="o">+</span> <span class="s1">')</span><span class="se">\n</span><span class="s1">'</span>
<span class="n">num_devices</span> <span class="o">=</span> <span class="n">get_device_count</span><span class="p">()</span>
<span class="n">curr_device_id</span> <span class="o">=</span> <span class="n">get_device</span><span class="p">()</span>
<span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">num_devices</span><span class="p">):</span>
<span class="c1"># To suppress warnings on CPU</span>
<span class="k">if</span> <span class="p">(</span><span class="n">n</span> <span class="o">!=</span> <span class="n">curr_device_id</span><span class="p">):</span>
<span class="n">set_device</span><span class="p">(</span><span class="n">n</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span><span class="n">n</span> <span class="o">==</span> <span class="n">curr_device_id</span><span class="p">):</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">'[</span><span class="si">%d</span><span class="s1">] '</span> <span class="o">%</span> <span class="n">n</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">'-</span><span class="si">%d</span><span class="s1">- '</span> <span class="o">%</span> <span class="n">n</span>
<span class="n">dev_info</span> <span class="o">=</span> <span class="n">device_info</span><span class="p">()</span>
<span class="k">if</span> <span class="p">(</span><span class="n">backend_str</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">==</span> <span class="s1">'opencl'</span><span class="p">):</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="n">dev_info</span><span class="p">[</span><span class="s1">'toolkit'</span><span class="p">]</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">': '</span> <span class="o">+</span> <span class="n">dev_info</span><span class="p">[</span><span class="s1">'device'</span><span class="p">]</span>
<span class="k">if</span> <span class="p">(</span><span class="n">backend_str</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="o">!=</span> <span class="s1">'cpu'</span><span class="p">):</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">' (Compute '</span> <span class="o">+</span> <span class="n">dev_info</span><span class="p">[</span><span class="s1">'compute'</span><span class="p">]</span> <span class="o">+</span> <span class="s1">')'</span>
<span class="n">res_str</span> <span class="o">+=</span> <span class="s1">'</span><span class="se">\n</span><span class="s1">'</span>
<span class="c1"># To suppress warnings on CPU</span>
<span class="k">if</span> <span class="p">(</span><span class="n">curr_device_id</span> <span class="o">!=</span> <span class="n">get_device</span><span class="p">()):</span>
<span class="n">set_device</span><span class="p">(</span><span class="n">curr_device_id</span><span class="p">)</span>
<span class="k">return</span> <span class="n">res_str</span></div>
<div class="viewcode-block" id="is_dbl_supported"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.is_dbl_supported">[docs]</a><span class="k">def</span> <span class="nf">is_dbl_supported</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Check if double precision is supported on specified device.</span>
<span class="sd"> Parameters</span>
<span class="sd"> -----------</span>
<span class="sd"> device: optional: int. default: None.</span>
<span class="sd"> id of the desired device.</span>
<span class="sd"> Returns</span>
<span class="sd"> --------</span>
<span class="sd"> - True if double precision supported.</span>
<span class="sd"> - False if double precision not supported.</span>
<span class="sd"> """</span>
<span class="n">dev</span> <span class="o">=</span> <span class="n">device</span> <span class="k">if</span> <span class="n">device</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">get_device</span><span class="p">()</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">c_bool_t</span><span class="p">(</span><span class="kc">False</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_dbl_support</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">res</span><span class="p">),</span> <span class="n">dev</span><span class="p">))</span>
<span class="k">return</span> <span class="n">res</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="is_half_supported"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.is_half_supported">[docs]</a><span class="k">def</span> <span class="nf">is_half_supported</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Check if half precision is supported on specified device.</span>
<span class="sd"> Parameters</span>
<span class="sd"> -----------</span>
<span class="sd"> device: optional: int. default: None.</span>
<span class="sd"> id of the desired device.</span>
<span class="sd"> Returns</span>
<span class="sd"> --------</span>
<span class="sd"> - True if half precision supported.</span>
<span class="sd"> - False if half precision not supported.</span>
<span class="sd"> """</span>
<span class="n">dev</span> <span class="o">=</span> <span class="n">device</span> <span class="k">if</span> <span class="n">device</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">get_device</span><span class="p">()</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">c_bool_t</span><span class="p">(</span><span class="kc">False</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_half_support</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">res</span><span class="p">),</span> <span class="n">dev</span><span class="p">))</span>
<span class="k">return</span> <span class="n">res</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="sync"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.sync">[docs]</a><span class="k">def</span> <span class="nf">sync</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Block until all the functions on the device have completed execution.</span>
<span class="sd"> Parameters</span>
<span class="sd"> -----------</span>
<span class="sd"> device: optional: int. default: None.</span>
<span class="sd"> id of the desired device.</span>
<span class="sd"> """</span>
<span class="n">dev</span> <span class="o">=</span> <span class="n">device</span> <span class="k">if</span> <span class="n">device</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">get_device</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_sync</span><span class="p">(</span><span class="n">dev</span><span class="p">))</span></div>
<span class="k">def</span> <span class="nf">__eval</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="n">nargs</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">args</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span><span class="n">nargs</span> <span class="o">==</span> <span class="mi">1</span><span class="p">):</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_eval</span><span class="p">(</span><span class="n">args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">arr</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">c_void_p_n</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span> <span class="o">*</span> <span class="n">nargs</span>
<span class="n">arrs</span> <span class="o">=</span> <span class="n">c_void_p_n</span><span class="p">()</span>
<span class="k">for</span> <span class="n">n</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">nargs</span><span class="p">):</span>
<span class="n">arrs</span><span class="p">[</span><span class="n">n</span><span class="p">]</span> <span class="o">=</span> <span class="n">args</span><span class="p">[</span><span class="n">n</span><span class="p">]</span><span class="o">.</span><span class="n">arr</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_eval_multiple</span><span class="p">(</span><span class="n">c_int_t</span><span class="p">(</span><span class="n">nargs</span><span class="p">),</span> <span class="n">c_pointer</span><span class="p">(</span><span class="n">arrs</span><span class="p">)))</span>
<span class="k">return</span>
<div class="viewcode-block" id="eval"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.eval">[docs]</a><span class="k">def</span> <span class="nf">eval</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Evaluate one or more inputs together</span>
<span class="sd"> Parameters</span>
<span class="sd"> -----------</span>
<span class="sd"> args : arguments to be evaluated</span>
<span class="sd"> Note</span>
<span class="sd"> -----</span>
<span class="sd"> All the input arrays to this function should be of the same size.</span>
<span class="sd"> Examples</span>
<span class="sd"> --------</span>
<span class="sd"> >>> a = af.constant(1, 3, 3)</span>
<span class="sd"> >>> b = af.constant(2, 3, 3)</span>
<span class="sd"> >>> c = a + b</span>
<span class="sd"> >>> d = a - b</span>
<span class="sd"> >>> af.eval(c, d) # A single kernel is launched here</span>
<span class="sd"> >>> c</span>
<span class="sd"> arrayfire.Array()</span>
<span class="sd"> Type: float</span>
<span class="sd"> [3 3 1 1]</span>
<span class="sd"> 3.0000 3.0000 3.0000</span>
<span class="sd"> 3.0000 3.0000 3.0000</span>
<span class="sd"> 3.0000 3.0000 3.0000</span>
<span class="sd"> >>> d</span>
<span class="sd"> arrayfire.Array()</span>
<span class="sd"> Type: float</span>
<span class="sd"> [3 3 1 1]</span>
<span class="sd"> -1.0000 -1.0000 -1.0000</span>
<span class="sd"> -1.0000 -1.0000 -1.0000</span>
<span class="sd"> -1.0000 -1.0000 -1.0000</span>
<span class="sd"> """</span>
<span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">args</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">arg</span><span class="p">,</span> <span class="n">Array</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">"All inputs to eval must be of type arrayfire.Array"</span><span class="p">)</span>
<span class="n">__eval</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span></div>
<div class="viewcode-block" id="set_manual_eval_flag"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.set_manual_eval_flag">[docs]</a><span class="k">def</span> <span class="nf">set_manual_eval_flag</span><span class="p">(</span><span class="n">flag</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Tells the backend JIT engine to disable heuristics for determining when to evaluate a JIT tree.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> flag : optional: bool.</span>
<span class="sd"> - Specifies if the heuristic evaluation of the JIT tree needs to be disabled.</span>
<span class="sd"> Note</span>
<span class="sd"> ----</span>
<span class="sd"> This does not affect the evaluation that occurs when a non JIT function forces the evaluation.</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_set_manual_eval_flag</span><span class="p">(</span><span class="n">flag</span><span class="p">))</span></div>
<div class="viewcode-block" id="get_manual_eval_flag"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.get_manual_eval_flag">[docs]</a><span class="k">def</span> <span class="nf">get_manual_eval_flag</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Query the backend JIT engine to see if the user disabled heuristic evaluation of the JIT tree.</span>
<span class="sd"> Note</span>
<span class="sd"> ----</span>
<span class="sd"> This does not affect the evaluation that occurs when a non JIT function forces the evaluation.</span>
<span class="sd"> """</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">c_bool_t</span><span class="p">(</span><span class="kc">False</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_manual_eval_flag</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">res</span><span class="p">)))</span>
<span class="k">return</span> <span class="n">res</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="device_mem_info"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.device_mem_info">[docs]</a><span class="k">def</span> <span class="nf">device_mem_info</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Returns a map with the following fields:</span>
<span class="sd"> - 'alloc': Contains the map of the following</span>
<span class="sd"> - 'buffers' : Total number of buffers allocated by memory manager.</span>
<span class="sd"> - 'bytes' : Total number of bytes allocated by memory manager.</span>
<span class="sd"> - 'lock': Contains the map of the following</span>
<span class="sd"> - 'buffers' : Total number of buffers currently in scope.</span>
<span class="sd"> - 'bytes' : Total number of bytes currently in scope.</span>
<span class="sd"> Note</span>
<span class="sd"> -----</span>
<span class="sd"> ArrayFire does not free memory when array goes out of scope. The memory is marked for reuse.</span>
<span class="sd"> - The difference between alloc buffers and lock buffers equals the number of free buffers.</span>
<span class="sd"> - The difference between alloc bytes and lock bytes equals the number of free bytes.</span>
<span class="sd"> """</span>
<span class="n">alloc_bytes</span> <span class="o">=</span> <span class="n">c_size_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">alloc_buffers</span> <span class="o">=</span> <span class="n">c_size_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">lock_bytes</span> <span class="o">=</span> <span class="n">c_size_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">lock_buffers</span> <span class="o">=</span> <span class="n">c_size_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_device_mem_info</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">alloc_bytes</span><span class="p">),</span> <span class="n">c_pointer</span><span class="p">(</span><span class="n">alloc_buffers</span><span class="p">),</span>
<span class="n">c_pointer</span><span class="p">(</span><span class="n">lock_bytes</span><span class="p">),</span> <span class="n">c_pointer</span><span class="p">(</span><span class="n">lock_buffers</span><span class="p">)))</span>
<span class="n">mem_info</span> <span class="o">=</span> <span class="p">{}</span>
<span class="n">mem_info</span><span class="p">[</span><span class="s1">'alloc'</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'buffers'</span> <span class="p">:</span> <span class="n">alloc_buffers</span><span class="o">.</span><span class="n">value</span><span class="p">,</span> <span class="s1">'bytes'</span> <span class="p">:</span> <span class="n">alloc_bytes</span><span class="o">.</span><span class="n">value</span><span class="p">}</span>
<span class="n">mem_info</span><span class="p">[</span><span class="s1">'lock'</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'buffers'</span> <span class="p">:</span> <span class="n">lock_buffers</span><span class="o">.</span><span class="n">value</span><span class="p">,</span> <span class="s1">'bytes'</span> <span class="p">:</span> <span class="n">lock_bytes</span><span class="o">.</span><span class="n">value</span><span class="p">}</span>
<span class="k">return</span> <span class="n">mem_info</span></div>
<div class="viewcode-block" id="print_mem_info"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.print_mem_info">[docs]</a><span class="k">def</span> <span class="nf">print_mem_info</span><span class="p">(</span><span class="n">title</span> <span class="o">=</span> <span class="s2">"Memory Info"</span><span class="p">,</span> <span class="n">device_id</span> <span class="o">=</span> <span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Prints the memory used for the specified device.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> title: optional. Default: "Memory Info"</span>
<span class="sd"> - Title to display before printing the memory info.</span>
<span class="sd"> device_id: optional. Default: None</span>
<span class="sd"> - Specifies the device for which the memory info should be displayed.</span>
<span class="sd"> - If None, uses the current device.</span>
<span class="sd"> Examples</span>
<span class="sd"> --------</span>
<span class="sd"> >>> a = af.randu(5,5)</span>
<span class="sd"> >>> af.print_mem_info()</span>
<span class="sd"> Memory Info</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> | POINTER | SIZE | AF LOCK | USER LOCK |</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> | 0x706400000 | 1 KB | Yes | No |</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> >>> b = af.randu(5,5)</span>
<span class="sd"> >>> af.print_mem_info()</span>
<span class="sd"> Memory Info</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> | POINTER | SIZE | AF LOCK | USER LOCK |</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> | 0x706400400 | 1 KB | Yes | No |</span>
<span class="sd"> | 0x706400000 | 1 KB | Yes | No |</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> >>> a = af.randu(1000,1000)</span>
<span class="sd"> >>> af.print_mem_info()</span>
<span class="sd"> Memory Info</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> | POINTER | SIZE | AF LOCK | USER LOCK |</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> | 0x706500000 | 3.815 MB | Yes | No |</span>
<span class="sd"> | 0x706400400 | 1 KB | Yes | No |</span>
<span class="sd"> | 0x706400000 | 1 KB | No | No |</span>
<span class="sd"> ---------------------------------------------------------</span>
<span class="sd"> """</span>
<span class="n">device_id</span> <span class="o">=</span> <span class="n">device_id</span> <span class="k">if</span> <span class="n">device_id</span> <span class="k">else</span> <span class="n">get_device</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_print_mem_info</span><span class="p">(</span><span class="n">title</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'utf-8'</span><span class="p">),</span> <span class="n">device_id</span><span class="p">))</span></div>
<div class="viewcode-block" id="device_gc"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.device_gc">[docs]</a><span class="k">def</span> <span class="nf">device_gc</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> Ask the garbage collector to free all unlocked memory</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_device_gc</span><span class="p">())</span></div>
<div class="viewcode-block" id="get_device_ptr"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.get_device_ptr">[docs]</a><span class="k">def</span> <span class="nf">get_device_ptr</span><span class="p">(</span><span class="n">a</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Get the raw device pointer of an array</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> a: af.Array</span>
<span class="sd"> - A multi dimensional arrayfire array.</span>
<span class="sd"> Returns</span>
<span class="sd"> -------</span>
<span class="sd"> - internal device pointer held by a</span>
<span class="sd"> Note</span>
<span class="sd"> -----</span>
<span class="sd"> - The device pointer of `a` is not freed by memory manager until `unlock_device_ptr()` is called.</span>
<span class="sd"> - This function enables the user to interoperate arrayfire with other CUDA/OpenCL/C libraries.</span>
<span class="sd"> """</span>
<span class="n">ptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_device_ptr</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">ptr</span><span class="p">),</span> <span class="n">a</span><span class="o">.</span><span class="n">arr</span><span class="p">))</span>
<span class="k">return</span> <span class="n">ptr</span></div>
<div class="viewcode-block" id="lock_device_ptr"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.lock_device_ptr">[docs]</a><span class="k">def</span> <span class="nf">lock_device_ptr</span><span class="p">(</span><span class="n">a</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This functions is deprecated. Please use lock_array instead.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">warnings</span>
<span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s2">"This function is deprecated. Use lock_array instead."</span><span class="p">,</span> <span class="ne">DeprecationWarning</span><span class="p">)</span>
<span class="n">lock_array</span><span class="p">(</span><span class="n">a</span><span class="p">)</span></div>
<div class="viewcode-block" id="lock_array"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.lock_array">[docs]</a><span class="k">def</span> <span class="nf">lock_array</span><span class="p">(</span><span class="n">a</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Ask arrayfire to not perform garbage collection on raw data held by an array.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> a: af.Array</span>
<span class="sd"> - A multi dimensional arrayfire array.</span>
<span class="sd"> Note</span>
<span class="sd"> -----</span>
<span class="sd"> - The device pointer of `a` is not freed by memory manager until `unlock_array()` is called.</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_lock_array</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">arr</span><span class="p">))</span></div>
<div class="viewcode-block" id="is_locked_array"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.is_locked_array">[docs]</a><span class="k">def</span> <span class="nf">is_locked_array</span><span class="p">(</span><span class="n">a</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Check if the input array is locked by the user.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> a: af.Array</span>
<span class="sd"> - A multi dimensional arrayfire array.</span>
<span class="sd"> Returns</span>
<span class="sd"> -----------</span>
<span class="sd"> A bool specifying if the input array is locked.</span>
<span class="sd"> """</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">c_bool_t</span><span class="p">(</span><span class="kc">False</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_is_locked_array</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">res</span><span class="p">),</span> <span class="n">a</span><span class="o">.</span><span class="n">arr</span><span class="p">))</span>
<span class="k">return</span> <span class="n">res</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="unlock_device_ptr"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.unlock_device_ptr">[docs]</a><span class="k">def</span> <span class="nf">unlock_device_ptr</span><span class="p">(</span><span class="n">a</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This functions is deprecated. Please use unlock_array instead.</span>
<span class="sd"> """</span>
<span class="kn">import</span> <span class="nn">warnings</span>
<span class="n">warnings</span><span class="o">.</span><span class="n">warn</span><span class="p">(</span><span class="s2">"This function is deprecated. Use unlock_array instead."</span><span class="p">,</span> <span class="ne">DeprecationWarning</span><span class="p">)</span>
<span class="n">unlock_array</span><span class="p">(</span><span class="n">a</span><span class="p">)</span></div>
<div class="viewcode-block" id="unlock_array"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.unlock_array">[docs]</a><span class="k">def</span> <span class="nf">unlock_array</span><span class="p">(</span><span class="n">a</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Tell arrayfire to resume garbage collection on raw data held by an array.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> a: af.Array</span>
<span class="sd"> - A multi dimensional arrayfire array.</span>
<span class="sd"> """</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_unlock_array</span><span class="p">(</span><span class="n">a</span><span class="o">.</span><span class="n">arr</span><span class="p">))</span></div>
<div class="viewcode-block" id="alloc_device"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.alloc_device">[docs]</a><span class="k">def</span> <span class="nf">alloc_device</span><span class="p">(</span><span class="n">num_bytes</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Allocate a buffer on the device with specified number of bytes.</span>
<span class="sd"> """</span>
<span class="n">ptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">c_num_bytes</span> <span class="o">=</span> <span class="n">c_dim_t</span><span class="p">(</span><span class="n">num_bytes</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_alloc_device</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">ptr</span><span class="p">),</span> <span class="n">c_num_bytes</span><span class="p">))</span>
<span class="k">return</span> <span class="n">ptr</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="alloc_host"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.alloc_host">[docs]</a><span class="k">def</span> <span class="nf">alloc_host</span><span class="p">(</span><span class="n">num_bytes</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Allocate a buffer on the host with specified number of bytes.</span>
<span class="sd"> """</span>
<span class="n">ptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">c_num_bytes</span> <span class="o">=</span> <span class="n">c_dim_t</span><span class="p">(</span><span class="n">num_bytes</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_alloc_host</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">ptr</span><span class="p">),</span> <span class="n">c_num_bytes</span><span class="p">))</span>
<span class="k">return</span> <span class="n">ptr</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="alloc_pinned"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.alloc_pinned">[docs]</a><span class="k">def</span> <span class="nf">alloc_pinned</span><span class="p">(</span><span class="n">num_bytes</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Allocate a buffer on the host using pinned memory with specified number of bytes.</span>
<span class="sd"> """</span>
<span class="n">ptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">c_num_bytes</span> <span class="o">=</span> <span class="n">c_dim_t</span><span class="p">(</span><span class="n">num_bytes</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_alloc_pinned</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">ptr</span><span class="p">),</span> <span class="n">c_num_bytes</span><span class="p">))</span>
<span class="k">return</span> <span class="n">ptr</span><span class="o">.</span><span class="n">value</span></div>
<div class="viewcode-block" id="free_device"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.free_device">[docs]</a><span class="k">def</span> <span class="nf">free_device</span><span class="p">(</span><span class="n">ptr</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Free the device memory allocated by alloc_device</span>
<span class="sd"> """</span>
<span class="n">cptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="n">ptr</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_free_device</span><span class="p">(</span><span class="n">cptr</span><span class="p">))</span></div>
<div class="viewcode-block" id="free_host"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.free_host">[docs]</a><span class="k">def</span> <span class="nf">free_host</span><span class="p">(</span><span class="n">ptr</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Free the host memory allocated by alloc_host</span>
<span class="sd"> """</span>
<span class="n">cptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="n">ptr</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_free_host</span><span class="p">(</span><span class="n">cptr</span><span class="p">))</span></div>
<div class="viewcode-block" id="free_pinned"><a class="viewcode-back" href="../../arrayfire.device.html#arrayfire.device.free_pinned">[docs]</a><span class="k">def</span> <span class="nf">free_pinned</span><span class="p">(</span><span class="n">ptr</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Free the pinned memory allocated by alloc_pinned</span>
<span class="sd"> """</span>
<span class="n">cptr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="n">ptr</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_free_pinned</span><span class="p">(</span><span class="n">cptr</span><span class="p">))</span></div>
<span class="kn">from</span> <span class="nn">.array</span> <span class="kn">import</span> <span class="n">Array</span>
</pre></div>
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