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ETL (Expressions Template Library) is a header-only library for C++ providing vector and matrix classes with support for Expression Templates to perform very efficient operations on them.

The library supports numerous features:

• Matrix and vector (runtime-sized and compile-time-sized)
• Simple element-wise operations
• Reductions (sum, mean, max, ...)
• Unary operations (sigmoid, log, exp, abs, ...)
• Matrix multiplication
• Convolution (1D and 2D and higher variations)
• Max Pooling
• Fast Fourrier Transform
• Symmetric matrix adapter (experimental)
• Sparse matrix (experimental)