add ftrl optimizer #11547
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add ftrl optimizer #11547
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project: #10868
“FtrlOptimizer更新方法主要用于广告点击预测，广告点击预测通常千万级别的维度,因此有巨量的稀疏权重。其主要特点是将接近0 的权重直接置0，这样计算时可以直接跳过，从而简化计算。这个方法已经验证过在股票数据上较有效。”