Implement extension for dpnp.choose (#2201)

This PR implements a new SYCL kernel for `dpnp.choose` in a new
extension, `_indexing_impl`.

`choose` is an embarrassingly parallel copy operation, where the array
to copy from is chosen from a list based on the index in the indices
array. 7a782ae

Author: github-actions[bot]

.buildinfo

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-config: 903f48f5c5bed58238ca28e877dfdaf6
+config: 1f72b0b94ca1cedf9d46943930a1e823
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_modules/dpnp/dpnp_array.html

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     </script>
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_array &mdash; Data Parallel Extension for NumPy 0.17.0dev5+16.gda2eeba4c65 documentation</title>
+  <title>dpnp.dpnp_array &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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@@ -970,15 +970,15 @@ <h1>Source code for dpnp.dpnp_array</h1><div class="highlight"><pre>
 
 <div class="viewcode-block" id="dpnp_array.choose">
 <a class="viewcode-back" href="../../reference/generated/dpnp.dpnp_array.dpnp_array.choose.html#dpnp.dpnp_array.dpnp_array.choose">[docs]</a>
-    <span class="k">def</span><span class="w"> </span><span class="nf">choose</span><span class="p">(</span><span class="nb">input</span><span class="p">,</span> <span class="n">choices</span><span class="p">,</span> <span class="n">out</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s2">&quot;raise&quot;</span><span class="p">):</span>
+    <span class="k">def</span><span class="w"> </span><span class="nf">choose</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">/</span><span class="p">,</span> <span class="n">choices</span><span class="p">,</span> <span class="n">out</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s2">&quot;wrap&quot;</span><span class="p">):</span>
 <span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
-<span class="sd">        Construct an array from an index array and a set of arrays to choose from.</span>
+<span class="sd">        Use an array as index array to construct a new array from a set of choices.</span>
 
 <span class="sd">        Refer to :obj:`dpnp.choose` for full documentation.</span>
 
 <span class="sd">        &quot;&quot;&quot;</span>
 
-        <span class="k">return</span> <span class="n">dpnp</span><span class="o">.</span><span class="n">choose</span><span class="p">(</span><span class="nb">input</span><span class="p">,</span> <span class="n">choices</span><span class="p">,</span> <span class="n">out</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span></div>
+        <span class="k">return</span> <span class="n">dpnp</span><span class="o">.</span><span class="n">choose</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">choices</span><span class="p">,</span> <span class="n">out</span><span class="p">,</span> <span class="n">mode</span><span class="p">)</span></div>
 
 
 <div class="viewcode-block" id="dpnp_array.clip">

_modules/dpnp/dpnp_array_api_info.html

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     </script>
 
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-  <title>dpnp.dpnp_array_api_info &mdash; Data Parallel Extension for NumPy 0.17.0dev5+16.gda2eeba4c65 documentation</title>
+  <title>dpnp.dpnp_array_api_info &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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+  <title>dpnp.dpnp_flatiter &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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-  <title>dpnp.dpnp_iface &mdash; Data Parallel Extension for NumPy 0.17.0dev5+16.gda2eeba4c65 documentation</title>
+  <title>dpnp.dpnp_iface &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-  <title>dpnp.dpnp_iface_arraycreation &mdash; Data Parallel Extension for NumPy 0.17.0dev5+16.gda2eeba4c65 documentation</title>
+  <title>dpnp.dpnp_iface_arraycreation &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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+  <title>dpnp.dpnp_iface_bitwise &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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+  <title>dpnp.dpnp_iface_counting &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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+  <title>dpnp.dpnp_iface_functional &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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+  <title>dpnp.dpnp_iface_histograms &mdash; Data Parallel Extension for NumPy 0.17.0dev5+18.g7a782ae539e documentation</title>
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