README.md

CARL

The implementation of “A Context-Aware User-Item Representation Learning for Item Recommendation”, Libing Wu, Cong Quan, Chenliang Li, Qian Wang, Bolong Zheng, Xiangyang Luo, https://dl.acm.org/citation.cfm?id=3298988

Requirements

Tensorflow 1.2

Python 2.7

Numpy

Scipy

Data Preparation

To run CARL, 6 files are required:

Training Rating records:

file_name=TrainInteraction.out

each training sample is a sequence as:

UserId\tItemId\tRating\tDate

Example: 0\t3\t5.0\t1393545600

Validate Rating records:

file_name=ValInteraction.out

The format is the same as the training data format.

Testing Rating records:

file_name=TestInteraction.out

The format is the same as the training data format.

Word2Id diction:

file_name=WordDict.out

Each line follows the format as:

Word\tWord_Id

Example: love\t0

User Review Document:

file_name=UserReviews.out

each line is the format as:

UserId\tWord1 Word2 Word3 …

Example:0\tI love to eat hamburger …

Item Review Document:

file_name=ItemReviews.out

The format is the same as the user review doc format.

Note that:

All files need to be located in the same directory.

Besides, the code also supports to leverage the pretrained word embedding via uncomment the loading function “word2vec_word_embed” in the main file .

Carl.py denotes the model named CARL; Review.py denotes the review-based component while Interaction.py denotes the interaction-based component.

Configurations

word_latent_dim: the dimension size of word embedding;

latent_dim: the latent dimension of the representation learned from the review documents (entity);

max_len: the maximum doc length;

num_filters: the number of filters of CNN network;

window_size: the length of the sliding window of CNN;

learning_rate: learning rate;

lambda_1: the weight of the regularization part;

drop_out: the keep probability of the drop out strategy;

batch_size: batch size;

epochs: number of training epoch;