Matrix Factorization w/ Sparse Embedding

The example demonstrates the basic usage of the SparseEmbedding operator in MXNet, adapted based on @leopd's recommender examples. The operator is available on both CPU and GPU. This is for demonstration purpose only.

• get_data.sh
• perl train.pl
• To compare the training speed with (dense) Embedding, run perl train.pl --use-dense 1
• To run the example on the GPU, run perl train.pl --use-gpu 1