Comments (4)
Hello,感谢您的关注
这个包是支持多值特征的,但没有在主要models里支持(因为paper本身并没有采用多值特征),主要是在sequence
模块提供支持,具体如下可以参考文档中这个部分 https://deepctr-doc.readthedocs.io/en/latest/deepctr.sequence.html
下面以简单的pooling操作为例说明,
这里比如说我们输入一个含有多值电影标签的含有两个样本batch数据为
from deepctr.sequence import SequencePoolingLayer
#首先对变长多值特征进行padding,比如这里我们padding到长度为7
movie_tags = [ [0,1,2,0,0,0,0],#movie1 具有0,1,2 一共3个标签
[0,1,2,3,4,0,0]]#movie2 具有0,1,2,3,4 一共5个标签
tags_len = [[3],[5]]#这里记得输入变长特征的有效长度
model_input = [movie_tags,tags_len]
#之后我们可以根据输入拿到对应的embeddding矩阵tag_embedding
#按照API的要求输入embedding矩阵和长度
tags_pooling = SequencePoolingLayer(seq_len_max=7, mode='mean',)([tag_embedding,tags_len_input])
#这样就得到了对变长多值特征的一个定长表示,后续可以进行其他操作
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谢谢啦。我可以理解为包里面的模型不支持这种多值embeding的特征吗?因为多值不定长的特征在实际做ctr时中还是很常见的。如果我想把这类特征加入到模型有其他办法不?。顺便问下。这个deepctr的模型存储和加载是和keras中的模型储存和加载操作一样的不。
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目前models中只有DIN是原生支持多值embedding输入的。目前除了用DIN的话就只能去修改一下models里的代码,如果你熟悉tensorflow或者Keras的话应该改起来还是蛮快的。
后续我也会给其他model添加一下多值特征的支持,目前主要还没想好一个简洁通用的方式,另外是否能够提供一个含有多值特征的公开数据集?我可以简单的加个demo。
模型的存储和加载操作是和keras models一样的,但是因为modelsl里用了很多自定义的Layer,在load_model
的时候如果提示找不到Layer在custom_objects
指定一下就可以了~(这个后续我也会更新到文档里)
感谢你的关注~
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谢谢解答。数据的话tencent2018的广告算法大赛和ijcai2018的数据应该可以用吧。。再次感谢。。
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