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<title>arrayfire.index — ArrayFire Python documentation</title>
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<h1>Source code for arrayfire.index</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">Index and Seq classes used in indexing operations.</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="o">*</span>
<span class="kn">from</span> <span class="nn">.util</span> <span class="kn">import</span> <span class="n">_is_number</span>
<span class="kn">from</span> <span class="nn">.base</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.bcast</span> <span class="kn">import</span> <span class="n">_bcast_var</span>
<span class="kn">import</span> <span class="nn">math</span>
<div class="viewcode-block" id="Seq"><a class="viewcode-back" href="../../arrayfire.index.html#arrayfire.index.Seq">[docs]</a><span class="k">class</span> <span class="nc">Seq</span><span class="p">(</span><span class="n">ct</span><span class="o">.</span><span class="n">Structure</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> arrayfire equivalent of slice</span>
<span class="sd"> Attributes</span>
<span class="sd"> ----------</span>
<span class="sd"> begin: number</span>
<span class="sd"> Start of the sequence.</span>
<span class="sd"> end : number</span>
<span class="sd"> End of sequence.</span>
<span class="sd"> step : number</span>
<span class="sd"> Step size.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> S: slice or number.</span>
<span class="sd"> """</span>
<span class="n">_fields_</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"begin"</span><span class="p">,</span> <span class="n">c_double_t</span><span class="p">),</span>
<span class="p">(</span><span class="s2">"end"</span> <span class="p">,</span> <span class="n">c_double_t</span><span class="p">),</span>
<span class="p">(</span><span class="s2">"step"</span> <span class="p">,</span> <span class="n">c_double_t</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">S</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o">=</span> <span class="n">c_double_t</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">end</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">step</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">_is_number</span><span class="p">(</span><span class="n">S</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span><span class="n">S</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span><span class="n">S</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">S</span><span class="p">,</span> <span class="nb">slice</span><span class="p">):</span>
<span class="k">if</span> <span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">step</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">step</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">step</span><span class="p">)</span>
<span class="k">if</span><span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">step</span> <span class="o"><</span> <span class="mi">0</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">begin</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">begin</span>
<span class="k">if</span> <span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">start</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">start</span><span class="p">)</span>
<span class="k">if</span> <span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">stop</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">=</span> <span class="n">c_double_t</span><span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">stop</span><span class="p">)</span>
<span class="c1"># handle special cases</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o">>=</span> <span class="mi">0</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">>=</span><span class="mi">0</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o"><=</span> <span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">step</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o">=</span> <span class="mi">1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">=</span> <span class="mi">1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">step</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o"><</span> <span class="mi">0</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o"><</span> <span class="mi">0</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">>=</span> <span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">step</span> <span class="o"><=</span> <span class="mi">0</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">begin</span> <span class="o">=</span> <span class="o">-</span><span class="mi">2</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">=</span> <span class="o">-</span><span class="mi">2</span>
<span class="bp">self</span><span class="o">.</span><span class="n">step</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="k">if</span> <span class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">stop</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">end</span> <span class="o">-</span> <span class="n">math</span><span class="o">.</span><span class="n">copysign</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">step</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">IndexError</span><span class="p">(</span><span class="s2">"Invalid type while indexing arrayfire.array"</span><span class="p">)</span></div>
<div class="viewcode-block" id="ParallelRange"><a class="viewcode-back" href="../../arrayfire.index.html#arrayfire.index.ParallelRange">[docs]</a><span class="k">class</span> <span class="nc">ParallelRange</span><span class="p">(</span><span class="n">Seq</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Class used to parallelize for loop.</span>
<span class="sd"> Inherits from Seq.</span>
<span class="sd"> Attributes</span>
<span class="sd"> ----------</span>
<span class="sd"> S: slice</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> start: number</span>
<span class="sd"> Beginning of parallel range.</span>
<span class="sd"> stop : number</span>
<span class="sd"> End of parallel range.</span>
<span class="sd"> step : number</span>
<span class="sd"> Step size for parallel range.</span>
<span class="sd"> Examples</span>
<span class="sd"> --------</span>
<span class="sd"> >>> import arrayfire as af</span>
<span class="sd"> >>> a = af.randu(3, 3)</span>
<span class="sd"> >>> b = af.randu(3, 1)</span>
<span class="sd"> >>> c = af.constant(0, 3, 3)</span>
<span class="sd"> >>> for ii in af.ParallelRange(3):</span>
<span class="sd"> ... c[:, ii] = a[:, ii] + b</span>
<span class="sd"> ...</span>
<span class="sd"> >>> af.display(a)</span>
<span class="sd"> [3 3 1 1]</span>
<span class="sd"> 0.4107 0.1794 0.3775</span>
<span class="sd"> 0.8224 0.4198 0.3027</span>
<span class="sd"> 0.9518 0.0081 0.6456</span>
<span class="sd"> >>> af.display(b)</span>
<span class="sd"> [3 1 1 1]</span>
<span class="sd"> 0.7269</span>
<span class="sd"> 0.7104</span>
<span class="sd"> 0.5201</span>
<span class="sd"> >>> af.display(c)</span>
<span class="sd"> [3 3 1 1]</span>
<span class="sd"> 1.1377 0.9063 1.1045</span>
<span class="sd"> 1.5328 1.1302 1.0131</span>
<span class="sd"> 1.4719 0.5282 1.1657</span>
<span class="sd"> """</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">start</span><span class="p">,</span> <span class="n">stop</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">step</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="p">(</span><span class="n">stop</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">):</span>
<span class="n">stop</span> <span class="o">=</span> <span class="n">start</span>
<span class="n">start</span> <span class="o">=</span> <span class="mi">0</span>
<span class="bp">self</span><span class="o">.</span><span class="n">S</span> <span class="o">=</span> <span class="nb">slice</span><span class="p">(</span><span class="n">start</span><span class="p">,</span> <span class="n">stop</span><span class="p">,</span> <span class="n">step</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">ParallelRange</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="bp">self</span><span class="o">.</span><span class="n">S</span><span class="p">)</span>
<span class="k">def</span> <span class="fm">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span>
<div class="viewcode-block" id="ParallelRange.next"><a class="viewcode-back" href="../../arrayfire.index.html#arrayfire.index.ParallelRange.next">[docs]</a> <span class="k">def</span> <span class="nf">next</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Function called by the iterator in Python 2</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">_bcast_var</span><span class="o">.</span><span class="n">get</span><span class="p">()</span> <span class="ow">is</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">_bcast_var</span><span class="o">.</span><span class="n">toggle</span><span class="p">()</span>
<span class="k">raise</span> <span class="ne">StopIteration</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">_bcast_var</span><span class="o">.</span><span class="n">toggle</span><span class="p">()</span>
<span class="k">return</span> <span class="bp">self</span></div>
<span class="k">def</span> <span class="fm">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Function called by the iterator in Python 3</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">next</span><span class="p">()</span></div>
<span class="k">class</span> <span class="nc">_uidx</span><span class="p">(</span><span class="n">ct</span><span class="o">.</span><span class="n">Union</span><span class="p">):</span>
<span class="n">_fields_</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"arr"</span><span class="p">,</span> <span class="n">c_void_ptr_t</span><span class="p">),</span>
<span class="p">(</span><span class="s2">"seq"</span><span class="p">,</span> <span class="n">Seq</span><span class="p">)]</span>
<div class="viewcode-block" id="Index"><a class="viewcode-back" href="../../arrayfire.index.html#arrayfire.index.Index">[docs]</a><span class="k">class</span> <span class="nc">Index</span><span class="p">(</span><span class="n">ct</span><span class="o">.</span><span class="n">Structure</span><span class="p">):</span>
<span class="n">_fields_</span> <span class="o">=</span> <span class="p">[(</span><span class="s2">"idx"</span><span class="p">,</span> <span class="n">_uidx</span><span class="p">),</span>
<span class="p">(</span><span class="s2">"isSeq"</span><span class="p">,</span> <span class="n">c_bool_t</span><span class="p">),</span>
<span class="p">(</span><span class="s2">"isBatch"</span><span class="p">,</span> <span class="n">c_bool_t</span><span class="p">)]</span>
<span class="sd">"""</span>
<span class="sd"> Container for the index class in arrayfire C library</span>
<span class="sd"> Attributes</span>
<span class="sd"> ----------</span>
<span class="sd"> idx.arr: ctypes.c_void_p</span>
<span class="sd"> - Default 0</span>
<span class="sd"> idx.seq: af.Seq</span>
<span class="sd"> - Default af.Seq(0, -1, 1)</span>
<span class="sd"> isSeq : bool</span>
<span class="sd"> - Default True</span>
<span class="sd"> isBatch : bool</span>
<span class="sd"> - Default False</span>
<span class="sd"> Parameters</span>
<span class="sd"> -----------</span>
<span class="sd"> idx: key</span>
<span class="sd"> - If of type af.Array, self.idx.arr = idx, self.isSeq = False</span>
<span class="sd"> - If of type af.ParallelRange, self.idx.seq = idx, self.isBatch = True</span>
<span class="sd"> - Default:, self.idx.seq = af.Seq(idx)</span>
<span class="sd"> Note</span>
<span class="sd"> ----</span>
<span class="sd"> Implemented for internal use only. Use with extreme caution.</span>
<span class="sd"> """</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">idx</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">idx</span> <span class="o">=</span> <span class="n">_uidx</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">isBatch</span> <span class="o">=</span> <span class="kc">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">isSeq</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">idx</span><span class="p">,</span> <span class="n">BaseArray</span><span class="p">):</span>
<span class="n">arr</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="k">if</span> <span class="p">(</span><span class="n">idx</span><span class="o">.</span><span class="n">type</span><span class="p">()</span> <span class="o">==</span> <span class="n">Dtype</span><span class="o">.</span><span class="n">b8</span><span class="o">.</span><span class="n">value</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_where</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">arr</span><span class="p">),</span> <span class="n">idx</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">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_retain_array</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">arr</span><span class="p">),</span> <span class="n">idx</span><span class="o">.</span><span class="n">arr</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">idx</span><span class="o">.</span><span class="n">arr</span> <span class="o">=</span> <span class="n">arr</span>
<span class="bp">self</span><span class="o">.</span><span class="n">isSeq</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">idx</span><span class="p">,</span> <span class="n">ParallelRange</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">idx</span><span class="o">.</span><span class="n">seq</span> <span class="o">=</span> <span class="n">idx</span>
<span class="bp">self</span><span class="o">.</span><span class="n">isBatch</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">idx</span><span class="o">.</span><span class="n">seq</span> <span class="o">=</span> <span class="n">Seq</span><span class="p">(</span><span class="n">idx</span><span class="p">)</span>
<span class="k">def</span> <span class="fm">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">isSeq</span><span class="p">:</span>
<span class="c1"># ctypes field variables are automatically</span>
<span class="c1"># converted to basic C types so we have to</span>
<span class="c1"># build the void_p from the value again.</span>
<span class="n">arr</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">idx</span><span class="o">.</span><span class="n">arr</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_release_array</span><span class="p">(</span><span class="n">arr</span><span class="p">)</span></div>
<span class="n">_span</span> <span class="o">=</span> <span class="n">Index</span><span class="p">(</span><span class="nb">slice</span><span class="p">(</span><span class="kc">None</span><span class="p">))</span>
<span class="k">class</span> <span class="nc">_Index4</span><span class="p">(</span><span class="nb">object</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">index_vec</span> <span class="o">=</span> <span class="n">Index</span> <span class="o">*</span> <span class="mi">4</span>
<span class="bp">self</span><span class="o">.</span><span class="n">array</span> <span class="o">=</span> <span class="n">index_vec</span><span class="p">(</span><span class="n">_span</span><span class="p">,</span> <span class="n">_span</span><span class="p">,</span> <span class="n">_span</span><span class="p">,</span> <span class="n">_span</span><span class="p">)</span>
<span class="c1"># Do not lose those idx as self.array keeps</span>
<span class="c1"># no reference to them. Otherwise the destructor</span>
<span class="c1"># is prematurely called</span>
<span class="bp">self</span><span class="o">.</span><span class="n">idxs</span> <span class="o">=</span> <span class="p">[</span><span class="n">_span</span><span class="p">,</span> <span class="n">_span</span><span class="p">,</span> <span class="n">_span</span><span class="p">,</span> <span class="n">_span</span><span class="p">]</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">pointer</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="n">c_pointer</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">array</span><span class="p">)</span>
<span class="k">def</span> <span class="fm">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">idx</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">array</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span>
<span class="k">def</span> <span class="fm">__setitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">idx</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">array</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span>
<span class="bp">self</span><span class="o">.</span><span class="n">idxs</span><span class="p">[</span><span class="n">idx</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span>
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