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Thrust v1.5.0 release

Thrust v1.5.0 provides introduces new programmer productivity and performance enhancements. New functionality for creating anonymous "lambda" functions has been added. A faster host sort provides 2-10x faster performance for sorting arithmetic types on (single-threaded) CPUs. A new OpenMP sort provides 2.5x-3.0x speedup over the host sort using a quad-core CPU. When sorting arithmetic types with the OpenMP backend the combined performance improvement is 5.9x for 32-bit integers and ranges from 3.0x (64-bit types) to 14.2x (8-bit types). A new CUDA reduce_by_key implementation provides 2-3x faster performance.

The CHANGELOG details the complete list of changes since v1.4.