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We describe ocl, a Python library built on top of pyOpenCL and numpy. It allows programming
GPU devices using Python. Python functions which are marked up using the provided
decorator, are converted into C99/OpenCL and compiled using the JIT at runtime. This
approach lowers the barrier to entry to programming GPU devices since it requires only
Python syntax and no external compilation or linking steps. The resulting Python program runs
even if a GPU is not available. As an example of application, we solve the problem of
computing the covariance matrix for historical stock prices and determining the optimal
portfolio according to Modern Portfolio Theory
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