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| <p>SQL functions for low-rank matrix factorization. |
| <a href="#details">More...</a></p> |
| |
| <p><a href="lmf_8sql__in_source.html">Go to the source code of this file.</a></p> |
| <table class="memberdecls"> |
| <tr><td colspan="2"><h2><a name="func-members"></a> |
| Functions</h2></td></tr> |
| <tr><td class="memItemLeft" align="right" valign="top">integer </td><td class="memItemRight" valign="bottom"><a class="el" href="lmf_8sql__in.html#ac1acb1f0e1f7008118f21c83546a4602">lmf_igd_run</a> (varchar rel_output, regclass rel_source, varchar col_row, varchar col_column, varchar col_value, integer row_dim="SELECT max(col_row) FROM rel_source", integer column_dim="SELECT max(col_col) FROM rel_source", integer max_rank=20, float8 stepsize=0.01, float8 scale_factor=0.1, integer num_iterations=10, float8 tolerance=0.0001)</td></tr> |
| <tr><td class="mdescLeft"> </td><td class="mdescRight">Low-rank matrix factorization of a incomplete matrix into two factors. <a href="#ac1acb1f0e1f7008118f21c83546a4602"></a><br/></td></tr> |
| </table> |
| <hr/><a name="details" id="details"></a><h2>Detailed Description</h2> |
| <div class="textblock"><dl class="date"><dt><b>Date:</b></dt><dd>June 2012</dd></dl> |
| <dl class="see"><dt><b>See also:</b></dt><dd>For a brief introduction to Low-rank Matrix Factorization, see the module description <a class="el" href="group__grp__lmf.html">Low-rank Matrix Factorization</a>. </dd></dl> |
| |
| <p>Definition in file <a class="el" href="lmf_8sql__in_source.html">lmf.sql_in</a>.</p> |
| </div><hr/><h2>Function Documentation</h2> |
| <a class="anchor" id="ac1acb1f0e1f7008118f21c83546a4602"></a><!-- doxytag: member="lmf.sql_in::lmf_igd_run" ref="ac1acb1f0e1f7008118f21c83546a4602" args="(varchar rel_output, regclass rel_source, varchar col_row, varchar col_column, varchar col_value, integer row_dim="SELECT max(col_row) FROM rel_source", integer column_dim="SELECT max(col_col) FROM rel_source", integer max_rank=20, float8 stepsize=0.01, float8 scale_factor=0.1, integer num_iterations=10, float8 tolerance=0.0001)" --> |
| <div class="memitem"> |
| <div class="memproto"> |
| <table class="memname"> |
| <tr> |
| <td class="memname">integer lmf_igd_run </td> |
| <td>(</td> |
| <td class="paramtype">varchar </td> |
| <td class="paramname"><em>rel_output</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">regclass </td> |
| <td class="paramname"><em>rel_source</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">varchar </td> |
| <td class="paramname"><em>col_row</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">varchar </td> |
| <td class="paramname"><em>col_column</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">varchar </td> |
| <td class="paramname"><em>col_value</em>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">integer </td> |
| <td class="paramname"><em>row_dim</em> = <code>"SELECT max(col_row) FROM rel_source"</code>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">integer </td> |
| <td class="paramname"><em>column_dim</em> = <code>"SELECT max(col_col) FROM rel_source"</code>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">integer </td> |
| <td class="paramname"><em>max_rank</em> = <code>20</code>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>stepsize</em> = <code>0.01</code>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>scale_factor</em> = <code>0.1</code>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">integer </td> |
| <td class="paramname"><em>num_iterations</em> = <code>10</code>, </td> |
| </tr> |
| <tr> |
| <td class="paramkey"></td> |
| <td></td> |
| <td class="paramtype">float8 </td> |
| <td class="paramname"><em>tolerance</em> = <code>0.0001</code> </td> |
| </tr> |
| <tr> |
| <td></td> |
| <td>)</td> |
| <td></td><td></td> |
| </tr> |
| </table> |
| </div> |
| <div class="memdoc"> |
| <p>This function takes as input the table representation of a incomplete matrix in the sparse (i, j, value) format and decomposes it into the specified set of most significant features of matrices of U and V matrix. The input matrix is expected to have dimension [1:row_dim][1:column_dim], but in sparse format.</p> |
| <dl><dt><b>Parameters:</b></dt><dd> |
| <table class="params"> |
| <tr><td class="paramname">rel_output</td><td>Name of the table that the factors will be appended to </td></tr> |
| <tr><td class="paramname">rel_source</td><td>Name of the table/view with the source data </td></tr> |
| <tr><td class="paramname">col_row</td><td>Name of the column containing cell row number </td></tr> |
| <tr><td class="paramname">col_column</td><td>Name of the column containing cell column number </td></tr> |
| <tr><td class="paramname">col_value</td><td>Name of the column containing cell value </td></tr> |
| <tr><td class="paramname">row_dim</td><td>Maximum number of rows of input </td></tr> |
| <tr><td class="paramname">column_dim</td><td>Maximum number of columns of input </td></tr> |
| <tr><td class="paramname">max_rank</td><td>Rank of desired approximation </td></tr> |
| <tr><td class="paramname">stepsize</td><td>Hyper-parameter that decides how aggressive that the gradient steps are </td></tr> |
| <tr><td class="paramname">scale_factor</td><td>Hyper-parameter that decides scale of initial factors </td></tr> |
| <tr><td class="paramname">num_iterations</td><td>Maximum number if iterations to perform regardless of convergence </td></tr> |
| <tr><td class="paramname">tolerance</td><td>Acceptable level of error in convergence. </td></tr> |
| </table> |
| </dd> |
| </dl> |
| |
| <p>Definition at line <a class="el" href="lmf_8sql__in_source.html#l00278">278</a> of file <a class="el" href="lmf_8sql__in_source.html">lmf.sql_in</a>.</p> |
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