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<div class="title">MnistDatabase.cpp</div> </div>
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<a href="_mnist_database_8cpp.xhtml">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Copyright © 2017 Arm Ltd. All rights reserved.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// SPDX-License-Identifier: MIT</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="_mnist_database_8hpp.xhtml">MnistDatabase.hpp</a>"</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include <<a class="code" href="_logging_8hpp.xhtml">armnn/Logging.hpp</a>></span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <fstream></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <vector></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"><a class="line" href="_mnist_database_8cpp.xhtml#a933b2eaa5ca0420cdc78044e959dcd6e"> 12</a></span> constexpr <span class="keywordtype">int</span> <a class="code" href="_mnist_database_8cpp.xhtml#a933b2eaa5ca0420cdc78044e959dcd6e">g_kMnistImageByteSize</a> = 28 * 28;</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"><a class="line" href="_mnist_database_8cpp.xhtml#a4388a1d2afb5b20ea6c7ebefcafeaf05"> 14</a></span> <span class="keywordtype">void</span> <a class="code" href="_mnist_database_8cpp.xhtml#a4388a1d2afb5b20ea6c7ebefcafeaf05">EndianSwap</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> &x)</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> {</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  x = (x >> 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x << 24);</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> }</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="class_mnist_database.xhtml#a66e5904e741dbce2d648bc9a02e7eb0e"> 19</a></span> <a class="code" href="class_mnist_database.xhtml#a66e5904e741dbce2d648bc9a02e7eb0e">MnistDatabase::MnistDatabase</a>(<span class="keyword">const</span> std::string& binaryFileDirectory, <span class="keywordtype">bool</span> scaleValues)</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  : m_BinaryDirectory(binaryFileDirectory)</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  , m_ScaleValues(scaleValues)</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> {</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> }</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="class_mnist_database.xhtml#a4808453ec85548b752bcc6d4c1bc90b2"> 25</a></span> std::unique_ptr<MnistDatabase::TTestCaseData> <a class="code" href="class_mnist_database.xhtml#a4808453ec85548b752bcc6d4c1bc90b2">MnistDatabase::GetTestCaseData</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> testCaseId)</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> {</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  std::vector<unsigned char> I(<a class="code" href="_mnist_database_8cpp.xhtml#a933b2eaa5ca0420cdc78044e959dcd6e">g_kMnistImageByteSize</a>);</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> label = 0;</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  std::string imagePath = m_BinaryDirectory + std::string(<span class="stringliteral">"t10k-images.idx3-ubyte"</span>);</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  std::string labelPath = m_BinaryDirectory + std::string(<span class="stringliteral">"t10k-labels.idx1-ubyte"</span>);</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  std::ifstream imageStream(imagePath, std::ios::binary);</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  std::ifstream labelStream(labelPath, std::ios::binary);</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">if</span> (!imageStream.is_open())</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a>(fatal) << <span class="stringliteral">"Failed to load "</span> << imagePath;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  }</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">if</span> (!labelStream.is_open())</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  {</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <a class="code" href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a>(fatal) << <span class="stringliteral">"Failed to load "</span> << imagePath;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> magic, num, row, col;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// Checks the files have the correct header.</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  imageStream.read(reinterpret_cast<char*>(&magic), <span class="keyword">sizeof</span>(magic));</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">if</span> (magic != 0x03080000)</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <a class="code" href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a>(fatal) << <span class="stringliteral">"Failed to read "</span> << imagePath;</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  }</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  labelStream.read(reinterpret_cast<char*>(&magic), <span class="keyword">sizeof</span>(magic));</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">if</span> (magic != 0x01080000)</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  {</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a>(fatal) << <span class="stringliteral">"Failed to read "</span> << labelPath;</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// Endian swaps the image and label file - all the integers in the files are stored in MSB first(high endian)</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// format, hence it needs to flip the bytes of the header if using it on Intel processors or low-endian machines</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  labelStream.read(reinterpret_cast<char*>(&num), <span class="keyword">sizeof</span>(num));</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  imageStream.read(reinterpret_cast<char*>(&num), <span class="keyword">sizeof</span>(num));</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <a class="code" href="_mnist_database_8cpp.xhtml#a4388a1d2afb5b20ea6c7ebefcafeaf05">EndianSwap</a>(num);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  imageStream.read(reinterpret_cast<char*>(&row), <span class="keyword">sizeof</span>(row));</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="_mnist_database_8cpp.xhtml#a4388a1d2afb5b20ea6c7ebefcafeaf05">EndianSwap</a>(row);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  imageStream.read(reinterpret_cast<char*>(&col), <span class="keyword">sizeof</span>(col));</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="_mnist_database_8cpp.xhtml#a4388a1d2afb5b20ea6c7ebefcafeaf05">EndianSwap</a>(col);</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// Reads image and label into memory.</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  imageStream.seekg(testCaseId * <a class="code" href="_mnist_database_8cpp.xhtml#a933b2eaa5ca0420cdc78044e959dcd6e">g_kMnistImageByteSize</a>, std::ios_base::cur);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  imageStream.read(reinterpret_cast<char*>(&I[0]), g_kMnistImageByteSize);</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  labelStream.seekg(testCaseId, std::ios_base::cur);</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  labelStream.read(reinterpret_cast<char*>(&label), 1);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">if</span> (!imageStream.good())</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  {</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a>(fatal) << <span class="stringliteral">"Failed to read "</span> << imagePath;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span> (!labelStream.good())</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <a class="code" href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a>(fatal) << <span class="stringliteral">"Failed to read "</span> << labelPath;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  std::vector<float> inputImageData;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  inputImageData.resize(g_kMnistImageByteSize);</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i = 0; i < col * row; ++i)</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Static_cast of unsigned char is safe with float</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  inputImageData[i] = <span class="keyword">static_cast<</span><span class="keywordtype">float</span><span class="keyword">></span>(I[i]);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span>(m_ScaleValues)</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  {</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  inputImageData[i] /= 255.0f;</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> std::make_unique<TTestCaseData>(label, std::move(inputImageData));</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div><div class="ttc" id="class_mnist_database_xhtml_a4808453ec85548b752bcc6d4c1bc90b2"><div class="ttname"><a href="class_mnist_database.xhtml#a4808453ec85548b752bcc6d4c1bc90b2">MnistDatabase::GetTestCaseData</a></div><div class="ttdeci">std::unique_ptr< TTestCaseData > GetTestCaseData(unsigned int testCaseId)</div><div class="ttdef"><b>Definition:</b> <a href="_mnist_database_8cpp_source.xhtml#l00025">MnistDatabase.cpp:25</a></div></div>
<div class="ttc" id="_mnist_database_8cpp_xhtml_a4388a1d2afb5b20ea6c7ebefcafeaf05"><div class="ttname"><a href="_mnist_database_8cpp.xhtml#a4388a1d2afb5b20ea6c7ebefcafeaf05">EndianSwap</a></div><div class="ttdeci">void EndianSwap(unsigned int &x)</div><div class="ttdef"><b>Definition:</b> <a href="_mnist_database_8cpp_source.xhtml#l00014">MnistDatabase.cpp:14</a></div></div>
<div class="ttc" id="class_mnist_database_xhtml_a66e5904e741dbce2d648bc9a02e7eb0e"><div class="ttname"><a href="class_mnist_database.xhtml#a66e5904e741dbce2d648bc9a02e7eb0e">MnistDatabase::MnistDatabase</a></div><div class="ttdeci">MnistDatabase(const std::string &binaryFileDirectory, bool scaleValues=false)</div><div class="ttdef"><b>Definition:</b> <a href="_mnist_database_8cpp_source.xhtml#l00019">MnistDatabase.cpp:19</a></div></div>
<div class="ttc" id="_logging_8hpp_xhtml_a7b6ad073975f437ec38ca7d20154727f"><div class="ttname"><a href="_logging_8hpp.xhtml#a7b6ad073975f437ec38ca7d20154727f">ARMNN_LOG</a></div><div class="ttdeci">#define ARMNN_LOG(severity)</div><div class="ttdef"><b>Definition:</b> <a href="_logging_8hpp_source.xhtml#l00202">Logging.hpp:202</a></div></div>
<div class="ttc" id="_mnist_database_8hpp_xhtml"><div class="ttname"><a href="_mnist_database_8hpp.xhtml">MnistDatabase.hpp</a></div></div>
<div class="ttc" id="_logging_8hpp_xhtml"><div class="ttname"><a href="_logging_8hpp.xhtml">Logging.hpp</a></div></div>
<div class="ttc" id="_mnist_database_8cpp_xhtml_a933b2eaa5ca0420cdc78044e959dcd6e"><div class="ttname"><a href="_mnist_database_8cpp.xhtml#a933b2eaa5ca0420cdc78044e959dcd6e">g_kMnistImageByteSize</a></div><div class="ttdeci">constexpr int g_kMnistImageByteSize</div><div class="ttdef"><b>Definition:</b> <a href="_mnist_database_8cpp_source.xhtml#l00012">MnistDatabase.cpp:12</a></div></div>
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