Session-based recommendations are highly relevant in many modern on-line
services (e.g. e-commerce, video streaming) and recommendation settings.
Recently, Recurrent Neural Networks have been shown to perform very well in
session-based settings. While in many session-based recommendation domains user
identifiers are hard to come by, there are also domains in which user profiles
are readily available. We propose a seamless way to personalize RNN models with
cross-session information transfer and devise a Hierarchical RNN model that
relays end evolves latent hidden states of the RNNs across user sessions.
Results on two industry datasets show large improvements over the session-only
RNNs.

本文研究在基于会话的推荐系统中，如何通过跨会话信息传递的层次循环神经网络模型，实现对用户兴趣的个性化推荐，数据实验表明该方法优于单纯使用基于会话的神经网络推荐方法。

使用分层循环神经网络进行基于会话的个性化推荐

Personalizing Session-based Recommendations with Hierarchical Recurrent  Neural Networks

Learning to learn has emerged as an important direction for achieving
artificial intelligence. Two of the primary barriers to its adoption are an
inability to scale to larger problems and a limited ability to generalize to
new tasks. We introduce a learned gradient descent optimizer that generalizes
well to new tasks, and which has significantly reduced memory and computation
overhead. We achieve this by introducing a novel hierarchical RNN architecture,
with minimal per-parameter overhead, augmented with additional architectural
features that mirror the known structure of optimization tasks. We also develop
a meta-training ensemble of small, diverse optimization tasks capturing common
properties of loss landscapes. The optimizer learns to outperform RMSProp/ADAM
on problems in this corpus. More importantly, it performs comparably or better
when applied to small convolutional neural networks, despite seeing no neural
networks in its meta-training set. Finally, it generalizes to train Inception
V3 and ResNet V2 architectures on the ImageNet dataset for thousands of steps,
optimization problems that are of a vastly different scale than those it was
trained on. We release an open source implementation of the meta-training
algorithm.

通过引入层次循环神经网络优化算法和基于元学习的小任务集，实现了一个新的学习梯度下降优化器，解决了在更大的问题上扩展能力不足和泛化能力受限问题，并在 ImageNet 数据集上通过数千步为 Inception V3 和 ResNet V2 架构进行了优化。