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jzhang533
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不用提在GPU还是CPU运行了，这个任务太简单了。
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training cost 那个图看起来太像心电图了，看看怎么样改一下能看出来cost是在降吧。（把test cost也画到图里）
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以前版本的这张图： https://githubraw.cdn.bcebos.com/PaddlePaddle/book/develop/01.fit_a_line/image/predictions.png?raw=true
还是比较容易让人看懂效果的。 可以考虑用matplotlib也打印出来类似的图，展示效果。 -
可以考虑对比一下mse loss 和 paddle的smooth_l1_loss （把结果都画到上面说的图上的话，能看出来区别）。
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linear_regression