sampling: add Top-nσ sampler (#11223)
* initial sampling changes:
* completed top nsigma sampler implementation
* apply parameter to only llama-cli
* updated readme
* added tests and fixed nsigma impl
* cleaned up pr
* format
* format
* format
* removed commented tests
* cleanup pr and remove explicit floats
* added top-k sampler to improve performance
* changed sigma to float
* fixed string format to float
* Update src/llama-sampling.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* Update common/sampling.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* Update src/llama-sampling.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* Update src/llama-sampling.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* Update src/llama-sampling.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* Update src/llama-sampling.cpp
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
* added llama_sampler_init
---------
Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
