Input layer representing a sparse array SparseF[] of (uint, float) pairs
auto l = SparseData(100); // 100 is the total dimensionality of the input space, // which means that the indices of the pairs SparseF are <= 100. For example, // [(13, 4.7), (2, -0.12), (87, 0.6)]
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Input layer representing a sparse array SparseF[] of (uint, float) pairs