WIP: Feature/autodiff #1366
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WIP: Feature/autodiff #1366
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MaxSagebaum
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Feb 7, 2025
…mple The test @autodiff function can now handle the "r = a + b;" case. This code: test: @autodiff @print type = { // A simple first function would be: // func: (a: double, b: double) -> double = { return a + b; } func: (a: double, b: double) -> (r: double) = { r = a + b; } // The generated autodiff forward transformation would be: // func_diff: (a: double, a_d: double, b: double, b_d: double) -> (r: double, r_d: double) = { // r_d = a * b_d + b * a_d; // r = a * b; // } } Generates the following, as reported by @print in the cppfront compile output: test:/* @autodiff @print */ type = { func:( in a: double, in b: double, ) -> (out r: double, ) = { r = a + b; return; } func_diff:( in a: double, in a_d: double, in b: double, in b_d: double, ) -> ( out r: double = 1, out r_d: double = 1, ) = { r_d = a * b_d + b * a_d; r = a * b; return; } } And a bug fix: When a file that contains Cpp2 code begins with Cpp1 #includes, preserve their position at the top of the generated file too. This allows a Cpp2 type's template parameter list to use types a from Cpp1 header file.
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Additional steps for making autodiff work.