Introduction : special issue of selected papers from ACML 2014

We are delighted to present this special issue of Machine Learning Journal with selected papers from the Sixth Asian Conference on Machine Learning (ACML 2014) held in Nha Trang City, Vietnam from 26 to 28 November 2014. ACML aims at providing a leading international forum for researchers in machine learning and related fields to share their new ideas and achievements. While located in Asia, the conference has a wide visibility to the international community. ACML was the first machine learning conference with two cycles of submissions with a strict double-blind review process, and this tradition continues. ACML 2014 received 80 submissions from 20 countries across Asia, Australasia, Europe and North America. Each paper was assigned with two meta-reviewers and at least four reviewers. In the end, 25 papers were accepted into the main program, accounting for an acceptance rate of 31.25 % (Phung and Li 2014).