神级程序员带来的：基于Python和Tensorflow的电影推荐算法！

发布时间：2020-12-17 01:20:08 所属栏目：Python 来源：网络整理

导读：p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,Arial,'Hiragino Sans GB','Microsoft YaHei',simsun;vertical-align:baseline;color:rgb(93,93,93);background-color:rgb(255,255,255);"

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<table style="margin:0px auto 10px;padding:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,247);">title<th style="margin:0px;padding:5px 10px;border-top-width:2px;border-top-color:rgb(187,247);">genres<th style="margin:0px;padding:5px 10px;border-top-width:2px;border-top-color:rgb(187,247);">9120<td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">162672</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Mohenjo Daro (2016)</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Adventure|Drama|Romance</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,247);">9121<td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">163056</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">Shin Godzilla (2016)</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">Action|Adventure|Fantasy|Sci-Fi</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,247);">9122<td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">163949</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">The Beatles: Eight Days a Week - The Touring Y...</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Documentary</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,247);">9123<td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">164977</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">The Gay Desperado (1936)</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">Comedy</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,247);">9124<td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">164979</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Women of '69,Unboxed</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Documentary</td></tr></table><p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">

<table style="margin:0px auto 10px;padding:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,247);">movieRow<th style="margin:0px;padding:5px 10px;border-top-width:2px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Adventure|Drama|Romance</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">9120</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">Action|Adventure|Fantasy|Sci-Fi</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">9121</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Documentary</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">9122</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">Comedy</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">9123</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">9124</td></tr></table><p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">

<table style="margin:0px auto 10px;padding:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">9120</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">Mohenjo Daro (2016)</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">9121</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">Shin Godzilla (2016)</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">9122</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">The Beatles: Eight Days a Week - The Touring Y...</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">9123</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">The Gay Desperado (1936)</td></tr><tr style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-color:rgb(187,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">9124</td><td style="margin:0px;padding:5px;border-color:rgb(218,Unboxed</td></tr></table><p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">第三步：构建模型

<pre style="margin-bottom:0px;padding-right:0px;padding-left:0px;border:0px;font-size:18px;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(93,255);"><pre class="source-code" style="margin-bottom:0px;padding:15px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:rgb(243,244,245);"><code style="margin:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">loss = <span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(64,160,112);">1/<span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(64,112);">2 tf.reduce_sum(((tf.matmul(X_parameters,Theta_parameters,transpose_b = True) - rating_norm) record) * <span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(64,112);">2) + <span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(64,112);">2 (tf.reduce_sum(X_parameters <span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(64,112);">2) + tf.reduce_sum(Theta_parameters <span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(64,112);">2))#基于内容的推荐算法模型<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">函数解释：

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">reduce_sum() 就是求和，reduce_sum( input_tensor,axis=None,keep_dims=False,name=None,reduction_indices=None)

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">reduce_sum() 参数解释：

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">查看训练结果

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">在终端输入 tensorboard --logir=./

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">第五步：评估模型

<pre style="margin-bottom:0px;padding-right:0px;padding-left:0px;border:0px;font-size:18px;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(93,245);"><code style="margin:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;">4037<span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;color:rgb(25,70,157);">.9002717628305<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">第六步：构建完整的电影推荐系统

<p style="margin-top:1em;margin-bottom:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,255);">本文章内容来自慕课网，仅供学习，如有侵权，联系删除

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<table style="margin:0px auto 10px;padding:0px;border:0px;font-size:18px;line-height:inherit;font-family:helvetica,simsun;vertical-align:baseline;border-spacing:0px;color:rgb(93,255);"><thead style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><tr class="firstRow" style="margin:0px;padding:0px;border-top:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;"><th style="margin:0px;padding:5px 10px;border-top-width:2px;border-top-color:rgb(187,187,187);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:rgb(247,247,247);">userId<th style="margin:0px;padding:5px 10px;border-top-width:2px;border-top-color:rgb(187,247);">movieId<th style="margin:0px;padding:5px 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style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">671</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">6269</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">4.0</td><td style="margin:0px;padding:5px;border-color:rgb(218,218);font-style:inherit;font-variant:inherit;font-weight:inherit;line-height:inherit;font-family:inherit;vertical-align:baseline;background:#FFFFFF;">1065149201</td></tr><tr 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