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<li class="navelem"><a class="el" href="dir_135820457b1e8e8dc5343e26fb29c1f8.html">sampling</a></li><li class="navelem"><a class="el" href="dir_577378e109fcef5e822b70d599376114.html">include</a></li> </ul>
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<div class="title">ebpps_sample.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * or more contributor license agreements. See the NOTICE file</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * distributed with this work for additional information</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * regarding copyright ownership. The ASF licenses this file</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * to you under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * &quot;License&quot;); you may not use this file except in compliance</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * with the License. You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * software distributed under the License is distributed on an</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * KIND, either express or implied. See the License for the</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> * specific language governing permissions and limitations</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> * under the License.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#ifndef _EBPPS_SAMPLE_HPP_</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#define _EBPPS_SAMPLE_HPP_</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &quot;common_defs.hpp&quot;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor">#include &quot;optional.hpp&quot;</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#include &quot;serde.hpp&quot;</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacedatasketches.html">datasketches</a> {</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="keyword">template</span>&lt;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keyword">typename</span> T,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keyword">typename</span> A = std::allocator&lt;T&gt;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;&gt;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="keyword">class </span>ebpps_sample {</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keyword">explicit</span> ebpps_sample(uint32_t k, <span class="keyword">const</span> A&amp; allocator = A());</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="comment">// constructor used to create a sample to merge one itme</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> TT&gt;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; ebpps_sample(TT&amp;&amp; item, <span class="keywordtype">double</span> theta, <span class="keyword">const</span> A&amp; allocator = A());</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="comment">// for deserialization</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="keyword">class </span>items_deleter;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; ebpps_sample(std::vector&lt;T, A&gt;&amp;&amp; data, optional&lt;T&gt;&amp;&amp; partial_item, <span class="keywordtype">double</span> c, <span class="keyword">const</span> A&amp; allocator = A());</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="keywordtype">void</span> reset();</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordtype">void</span> downsample(<span class="keywordtype">double</span> theta);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> FwdSample&gt;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordtype">void</span> merge(FwdSample&amp;&amp; other);</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; </div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="comment">// standard way to query the sample</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keyword">using</span> result_type = std::vector&lt;T, A&gt;;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; result_type get_sample() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordtype">double</span> get_c() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="comment">// intended for internal use</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="comment">// returns only full items</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; result_type get_full_items() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="comment">// intended for internal use</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="comment">// handles only the partial item</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordtype">bool</span> has_partial_item() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; T get_partial_item() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; string&lt;A&gt; to_string() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keyword">inline</span> uint32_t get_num_retained_items() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> TT = T, <span class="keyword">typename</span> SerDe = serde&lt;T&gt;, <span class="keyword">typename</span> std::enable_if&lt;std::is_arithmetic&lt;TT&gt;::value, <span class="keywordtype">int</span>&gt;::type = 0&gt;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keyword">inline</span> <span class="keywordtype">size_t</span> get_serialized_size_bytes(<span class="keyword">const</span> SerDe&amp; sd = SerDe()) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> TT = T, <span class="keyword">typename</span> SerDe = serde&lt;T&gt;, <span class="keyword">typename</span> std::enable_if&lt;!std::is_arithmetic&lt;TT&gt;::value, <span class="keywordtype">int</span>&gt;::type = 0&gt;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keyword">inline</span> <span class="keywordtype">size_t</span> get_serialized_size_bytes(<span class="keyword">const</span> SerDe&amp; sd = SerDe()) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="comment">// This is a convenience alias for users</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="comment">// The type returned by the following serialize method</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keyword">using</span> vector_bytes = std::vector&lt;uint8_t, typename std::allocator_traits&lt;A&gt;::template rebind_alloc&lt;uint8_t&gt;&gt;;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> SerDe = serde&lt;T&gt;&gt;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keywordtype">size_t</span> serialize(uint8_t* ptr, <span class="keyword">const</span> uint8_t* end_ptr, <span class="keyword">const</span> SerDe&amp; sd = SerDe()) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; </div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> SerDe = serde&lt;T&gt;&gt;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="keywordtype">void</span> serialize(std::ostream&amp; os, <span class="keyword">const</span> SerDe&amp; sd = SerDe()) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; </div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> SerDe = serde&lt;T&gt;&gt;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="keyword">static</span> std::pair&lt;ebpps_sample, size_t&gt; deserialize(<span class="keyword">const</span> uint8_t* ptr, <span class="keywordtype">size_t</span> size, <span class="keyword">const</span> SerDe&amp; sd = SerDe(), <span class="keyword">const</span> A&amp; allocator = A());</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> SerDe = serde&lt;T&gt;&gt;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="keyword">static</span> ebpps_sample deserialize(std::istream&amp; is, <span class="keyword">const</span> SerDe&amp; sd = SerDe(), <span class="keyword">const</span> A&amp; allocator = A());</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; <span class="keyword">class </span>const_iterator;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; const_iterator begin() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; </div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; const_iterator end() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; A allocator_;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordtype">double</span> c_; <span class="comment">// Current sample size, including fractional part</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; optional&lt;T&gt; partial_item_; <span class="comment">// a sample item corresponding to a partial weight</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; std::vector&lt;T, A&gt; data_; <span class="comment">// stored sampled items</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; <span class="keyword">template</span>&lt;<span class="keyword">typename</span> FwdItem&gt;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; <span class="keyword">inline</span> <span class="keywordtype">void</span> set_partial(FwdItem&amp;&amp; item);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; <span class="keywordtype">void</span> swap_with_partial();</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; <span class="keywordtype">void</span> move_one_to_partial();</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; <span class="keywordtype">void</span> subsample(uint32_t num_samples);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; </div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; <span class="keyword">static</span> <span class="keyword">inline</span> uint32_t random_idx(uint32_t max);</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; <span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> next_double();</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; </div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; <span class="keyword">friend</span> <span class="keyword">class </span>const_iterator;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;};</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; </div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> A&gt;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;<span class="keyword">class </span>ebpps_sample&lt;T, A&gt;::const_iterator {</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; <span class="keyword">using</span> iterator_category = std::input_iterator_tag;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; <span class="keyword">using</span> value_type = <span class="keyword">const</span> T&amp;;</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; <span class="keyword">using</span> difference_type = void;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; <span class="keyword">using</span> pointer = <span class="keyword">const</span> return_value_holder&lt;value_type&gt;;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; <span class="keyword">using</span> reference = value_type;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; </div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; const_iterator(<span class="keyword">const</span> const_iterator&amp; other);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; const_iterator&amp; operator++();</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; const_iterator&amp; operator++(<span class="keywordtype">int</span>);</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> const_iterator&amp; other) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> const_iterator&amp; other) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; reference operator*() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; pointer operator-&gt;() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; </div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160; <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> PARTIAL_IDX = <span class="keyword">static_cast&lt;</span><span class="keywordtype">size_t</span><span class="keyword">&gt;</span>(-1);</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; </div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; <span class="comment">// default iterator over sample</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; const_iterator(<span class="keyword">const</span> ebpps_sample&lt;T, A&gt;* sample);</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160; </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; <span class="keyword">const</span> ebpps_sample&lt;T, A&gt;* sample_;</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; <span class="keywordtype">size_t</span> idx_;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; <span class="keywordtype">bool</span> use_partial_;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; </div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; <span class="keyword">friend</span> <span class="keyword">class </span>ebpps_sample;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160;};</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160;} <span class="comment">// namespace datasketches</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160;<span class="preprocessor">#include &quot;ebpps_sample_impl.hpp&quot;</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160;<span class="preprocessor">#endif </span><span class="comment">// _EBPPS_SAMPLE_HPP_</span></div>
<div class="ttc" id="anamespacedatasketches_html"><div class="ttname"><a href="namespacedatasketches.html">datasketches</a></div><div class="ttdoc">DataSketches namespace.</div><div class="ttdef"><b>Definition:</b> binomial_bounds.hpp:38</div></div>
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