[ET-VK][Ops] quantization op shaders and impl

backends/vulkan/runtime/graph/ops/glsl/quantize.glslh

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#ifndef QUANTIZE_GLSLH
+#define QUANTIZE_GLSLH
+
+OUT_T quantize_val(IN_T value, float scale_val, int zero_point_val) {
+  float inv_scale = 1.0 / scale_val;
+
+  float rounded_float = round(inv_scale * float(value));
+
+  int qvalue = zero_point_val + int(rounded_float);
+
+  qvalue = max(qvalue, quant_min);
+  qvalue = min(qvalue, quant_max);
+
+  return OUT_T(qvalue);
+}
+
+#endif // QUANTIZE_GLSLH

backends/vulkan/runtime/graph/ops/glsl/quantize_buffer.glsl

@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#version 450 core
+
+#define PRECISION ${PRECISION}
+
+#define IN_T ${buffer_scalar_type(IN_DTYPE)}
+#define OUT_T ${buffer_scalar_type(OUT_DTYPE)}
+
+#define ${MODE}
+
+${define_active_storage_type("buffer")}
+${define_required_extensions(IN_DTYPE)}
+${define_required_extensions(OUT_DTYPE)}
+
+layout(std430) buffer;
+
+#include "indexing_utils.h"
+
+${layout_declare_tensor(B, "w", "t_out", OUT_DTYPE, "buffer")}
+${layout_declare_tensor(B, "r", "t_in", IN_DTYPE, "buffer")}
+
+$if MODE == "per_tensor":
+  layout(push_constant) uniform restrict Block {
+    float scale;
+    int zero_point;
+    int quant_min;
+    int quant_max;
+  };
+$if MODE == "per_token":
+  ${layout_declare_tensor(B, "r", "t_scale", "float", "buffer")}
+  ${layout_declare_tensor(B, "r", "t_zero_point", "int", "buffer")}
+
+  layout(push_constant) uniform restrict Block {
+    int num_tokens;
+    int quant_min;
+    int quant_max;
+  };
+
+${layout_declare_ubo(B, "int", "out_numel")}
+${layout_declare_ubo(B, "ivec4", "t_in_sizes")}
+${layout_declare_ubo(B, "ivec4", "t_in_strides")}
+${layout_declare_ubo(B, "ivec4", "t_out_sizes")}
+${layout_declare_ubo(B, "ivec4", "t_out_strides")}
+
+${layout_declare_spec_const(C, "int", "out_layout", "DEFAULT_LAYOUT")}
+${layout_declare_spec_const(C, "int", "in_layout", "DEFAULT_LAYOUT")}
+
+#include "quantize.glslh"
+
+layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;
+
+const lowp ivec4 out_dim_order = unhash_dim_order(out_layout);
+const lowp ivec4 in_dim_order = unhash_dim_order(in_layout);
+
+#ifdef per_tensor
+
+void quantize_per_tensor() {
+  const int out_bufi = int(gl_GlobalInvocationID.x);
+
+  if (out_bufi >= out_numel) {
+    return;
+  }
+
+  const ivec4 out_tidx = bufi_to_tidx(out_bufi, t_out_strides, out_dim_order);
+  const int in_bufi = tidx_to_bufi(out_tidx, t_in_strides);
+
+  IN_T value = t_in[in_bufi];
+  OUT_T qvalue = quantize_val(value, scale, zero_point);
+
+  t_out[out_bufi] = qvalue;
+}
+
+#else
+
+void quantize_per_token() {
+  const int out_bufi = int(gl_GlobalInvocationID.x);
+
+  if (out_bufi >= out_numel) {
+    return;
+  }
+
+  const ivec4 out_tidx = bufi_to_tidx(out_bufi, t_out_strides, out_dim_order);
+  const int in_bufi = tidx_to_bufi(out_tidx, t_in_strides);
+
+  IN_T value = t_in[in_bufi];
+
+  int token_idx = 0;
+
+  if (t_out_sizes.w > 1) {
+    // 4D tensor
+    token_idx = out_tidx.w * (t_out_sizes.z * t_out_sizes.y) + out_tidx.z * t_out_sizes.y + out_tidx.y;
+  } else if (t_out_sizes.z > 1) {
+    // 3D tensor
+    token_idx = out_tidx.z * t_out_sizes.y + out_tidx.y;
+  } else if (t_out_sizes.y > 1) {
+    // 2D tensor
+    token_idx = out_tidx.y;
+  }
+  // For 1D tensor, token_idx remains 0
+
+  token_idx = min(token_idx, num_tokens - 1);
+
+  OUT_T qvalue = quantize_val(value, t_scale[token_idx], t_zero_point[token_idx]);
+
+  t_out[out_bufi] = qvalue;
+}
+
+#endif
+
+void main() {
+  quantize_${MODE}();
+}

backends/vulkan/runtime/graph/ops/glsl/quantize_buffer.yaml

@@ -0,0 +1,18 @@
+quantize_buffer:
+  parameter_names_with_default_values:
+    IN_DTYPE: float
+    OUT_DTYPE: int32
+    MODE: per_tensor
+  generate_variant_forall:
+    IN_DTYPE:
+      - VALUE: half
+      - VALUE: float
+    OUT_DTYPE:
+      - VALUE: uint8
+      - VALUE: int8
+      - VALUE: int32
+  shader_variants:
+    - NAME: quantize_per_tensor_buffer
+      MODE: per_tensor
+    - NAME: quantize_per_token_buffer
+      MODE: per_token

backends/vulkan/runtime/graph/ops/glsl/quantize_texture.glsl

@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#version 450 core
+
+#define PRECISION ${PRECISION}
+
+#define IN_T ${buffer_scalar_type(IN_DTYPE)}
+#define FVEC4_T ${texel_load_type(IN_DTYPE, "texture3d")}
+
+#define OUT_T ${buffer_scalar_type(OUT_DTYPE)}
+#define IVEC4_T ${texel_load_type(OUT_DTYPE, "texture3d")}
+
+#define ${MODE}
+
+${define_active_storage_type("texture3d")}
+${define_required_extensions(IN_DTYPE)}
+${define_required_extensions(OUT_DTYPE)}
+
+#extension GL_EXT_control_flow_attributes : require
+
+layout(std430) buffer;
+
+${layout_declare_tensor(B, "w", "t_out", OUT_DTYPE, "texture3d")}
+${layout_declare_tensor(B, "r", "t_in", IN_DTYPE, "texture3d")}
+
+$if MODE == "per_tensor":
+  layout(push_constant) uniform restrict Block {
+    float scale;
+    int zero_point;
+    int quant_min;
+    int quant_max;
+  };
+$if MODE == "per_token":
+  ${layout_declare_tensor(B, "r", "t_scale", "float", "buffer")}
+  ${layout_declare_tensor(B, "r", "t_zero_point", "int", "buffer")}
+
+  layout(push_constant) uniform restrict Block {
+    int num_tokens;
+    int quant_min;
+    int quant_max;
+  };
+
+${layout_declare_ubo(B, "ivec3", "t_in_limits")}
+${layout_declare_ubo(B, "ivec3", "t_out_limits")}
+
+#include "indexing_utils.h"
+#include "quantize.glslh"
+
+layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;
+
+#ifdef per_tensor
+
+void quantize_per_tensor() {
+  const ivec3 pos = ivec3(gl_GlobalInvocationID);
+
+  if (any(greaterThanEqual(pos, t_in_limits))) {
+    return;
+  }
+
+  FVEC4_T intex = load_texel(t_in, pos);
+  IVEC4_T outtex;
+
+  [[unroll]] for (int i = 0; i < 4; ++i) {
+    IN_T value = IN_T(intex[i]);
+    OUT_T qvalue = quantize_val(value, scale, zero_point);
+    outtex[i] = qvalue;
+  }
+  write_texel(t_out, pos, outtex);
+}
+
+#else
+
+void quantize_per_token() {
+  const ivec3 pos = ivec3(gl_GlobalInvocationID);
+
+  if (any(greaterThanEqual(pos, t_in_limits))) {
+    return;
+  }
+
+  FVEC4_T intex = load_texel(t_in, pos);
+
+  int token_idx = 0;
+  ivec3 dims = t_in_limits;
+
+  if (dims.z > 1) {
+    // 3D tensor
+    token_idx = pos.z * dims.y + pos.y;
+  } else if (dims.y > 1) {
+    // 2D tensor
+    token_idx = pos.y;
+  }
+  // For 1D tensor, token_idx remains 0
+
+  token_idx = min(token_idx, num_tokens - 1);
+
+  // Scale and zero_point are prepacked as buffers, so direct access
+  float scale_val = t_scale[token_idx];
+  int zero_point_val = t_zero_point[token_idx];
+
+  IVEC4_T outtex;
+  [[unroll]] for (int i = 0; i < 4; ++i) {
+    IN_T value = IN_T(intex[i]);
+    OUT_T qvalue = quantize_val(value, scale_val, zero_point_val);
+    outtex[i] = qvalue;
+  }
+
+  write_texel(t_out, pos, outtex);
+}
+
+#endif
+
+void main() {
+  quantize_${MODE}();
+}

backends/vulkan/runtime/graph/ops/glsl/quantize_texture.yaml

@@ -0,0 +1,18 @@
+quantize_texture:
+  parameter_names_with_default_values:
+    IN_DTYPE: float
+    OUT_DTYPE: int32
+    MODE: per_tensor
+  generate_variant_forall:
+    IN_DTYPE:
+      - VALUE: half
+      - VALUE: float
+    OUT_DTYPE:
+      - VALUE: uint8
+      - VALUE: int8
+      - VALUE: int32
+  shader_variants:
+    - NAME: quantize_per_tensor_texture3d
+      MODE: per_tensor
+    - NAME: quantize_per_token_texture3d
+      MODE: per_token