Around 2013, AMD entered into an extended partnership with a group of companies to create the Heterogeneous Systems Architecture Foundation. These companies mostly ARM licensees and included Samsung, MediaTek, Texas Instruments (Ti), AMD, Imagination, Qualcomm, and even ARM themselves. The group was similar in nature to the one that AMD had with Motorola and Ti back before the Athlon processor came into existence. The partners were all working on technology and resource sharing to make programing for devices simpler. We also saw it as a chance for AMD to offset R&D costs and potentially enter into some beneficial agreements.
The average GPU is a pretty powerful computational device. The highly parallel design and efficient memory structure means that you can execute operations at a rate that puts most CPUs to shame. With the advent of Cuda and OpenCL the door was opened for developers to push workloads to the GPU and get back some pretty nice returns. Microsoft and many others joined in and began making access to the GPU simpler starting with DirectX 10.
In September of 2015 (that would be this year) AMD announced that they were splitting off their GPU business into the Radeon Technologies Group (RTG). This move had a number of reasons (most good) and would serve to distance the graphics group from the CPU business. After talking to a few investors they were very optimistic about this move and would consider investing in RTG where they might not have done so in AMD. The split was a long time coming and is actually how AMD should have handled the ATi buy back in 2006 (Merger with separate business units and not a complete buy out).