llama.cpp/vulkan-shaders/rope_head.comp

#include "types.comp"

#extension GL_EXT_shader_16bit_storage : require

layout(local_size_x = 1, local_size_y = 256, local_size_z = 1) in;

layout (binding = 0) readonly buffer X {A_TYPE data_a[];};
layout (binding = 1) readonly buffer Y {int data_pos[];};
layout (binding = 2) readonly buffer Z {float data_ff[];};
layout (binding = 3) writeonly buffer D {D_TYPE data_d[];};

layout (push_constant) uniform parameter {
    uint ncols;
    uint n_dims;
    float freq_scale;
    uint p_delta_rows;
    float freq_base;
    float ext_factor;
    float attn_factor;
    float corr_dims[2];
    float theta_scale;
    uint has_ff;
} p;

float rope_yarn_ramp(const float low, const float high, const uint i0) {
    const float y = (i0 / 2 - low) / max(0.001f, high - low);
    return 1.0f - min(1.0f, max(0.0f, y));
}

void rope_yarn(const float theta_extrap, const uint i0, out float cos_theta, out float sin_theta) {
    float mscale = p.attn_factor;
    // Get n-d rotational scaling corrected for extrapolation
    float theta_interp = p.freq_scale * theta_extrap;
    float theta = theta_interp;
    if (p.ext_factor != 0.0f) {
        float ramp_mix = rope_yarn_ramp(p.corr_dims[0], p.corr_dims[1], i0) * p.ext_factor;
        theta = theta_interp * (1 - ramp_mix) + theta_extrap * ramp_mix;

        // Get n-d magnitude scaling corrected for interpolation
        mscale *= 1.0f + 0.1f * log(1.0f / p.freq_scale);
    }
    cos_theta = cos(theta) * mscale;
    sin_theta = sin(theta) * mscale;
}