[ET-VK][Ops] dequantize_per_tensor.tensor variant (#12437)

# Context

We need a tensor variant for dequantize/quantize operators since that is the expected output of choose_qparams.

# Changes

This extends the logic that currently exists to support a tensor variant for scales and zeros.

Differential Revision: [D77746135](https://our.internmc.facebook.com/intern/diff/D77746135/)

Author: pytorchbot

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

@@ -27,9 +27,10 @@ ${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_declare_tensor(B, "r", "t_scale", "float", "buffer")}
+  ${layout_declare_tensor(B, "r", "t_zero_point", "int", "buffer")}
+
   layout(push_constant) uniform restrict Block {
-    float scale;
-    int zero_point;
     int quant_min;
     int quant_max;
   };
@@ -146,7 +147,7 @@ void dequantize_per_tensor() {
   const int in_bufi = tidx_to_bufi(out_tidx, t_in_strides);
 
   IN_T qvalue = t_in[in_bufi];
-  OUT_T value = dequantize_val(qvalue, scale, zero_point);
+  OUT_T value = dequantize_val(qvalue, t_scale[0], t_zero_point[0]);
 
   t_out[out_bufi] = value;
 }

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

@@ -30,9 +30,10 @@ ${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_declare_tensor(B, "r", "t_scale", "float", "buffer")}
+  ${layout_declare_tensor(B, "r", "t_zero_point", "int", "buffer")}
+
   layout(push_constant) uniform restrict Block {
-    float scale;
-    int zero_point;
     int quant_min;
     int quant_max;
   };
@@ -148,7 +149,8 @@ void dequantize_per_tensor() {
 
   [[unroll]] for (int i = 0; i < 4; ++i) {
     IN_T qvalue = IN_T(intex[i]);
-    OUT_T value = dequantize_val(qvalue, scale, zero_point);
+    OUT_T value = dequantize_val(qvalue, t_scale[0], t_zero_point[0]);
+
     $if OUT_DTYPE == "double":
       outtex[i] = float(value);
     $else:

backends/vulkan/runtime/graph/ops/impl/Dequantize.cpp

@@ -85,8 +85,6 @@ void add_dequantize_per_tensor_node(
   add_dtype_suffix(kernel_name, graph.dtype_of(input));
   add_dtype_suffix(kernel_name, graph.dtype_of(output));
 
-  float scale_val = static_cast<float>(graph.get_double(scale));
-  int zero_point_val = static_cast<int>(graph.get_int(zero_point));
   int quant_min_val = static_cast<int>(graph.get_int(quant_min));
   int quant_max_val = static_cast<int>(graph.get_int(quant_max));
 
@@ -100,23 +98,16 @@ void add_dequantize_per_tensor_node(
         graph.strides_ubo(input),
         graph.sizes_ubo(output),
         graph.strides_ubo(output)};
-    push_constants = {
-        PushConstantDataInfo(&scale_val, sizeof(float)),
-        PushConstantDataInfo(&zero_point_val, sizeof(int)),
-        PushConstantDataInfo(&quant_min_val, sizeof(int)),
-        PushConstantDataInfo(&quant_max_val, sizeof(int)),
-    };
   } else {
     param_ubos = {
         graph.logical_limits_ubo(input), graph.logical_limits_ubo(output)};
-    push_constants = {
-        PushConstantDataInfo(&scale_val, sizeof(float)),
-        PushConstantDataInfo(&zero_point_val, sizeof(int)),
-        PushConstantDataInfo(&quant_min_val, sizeof(int)),
-        PushConstantDataInfo(&quant_max_val, sizeof(int)),
-    };
   }
 
+  push_constants = {
+      PushConstantDataInfo(&quant_min_val, sizeof(int)),
+      PushConstantDataInfo(&quant_max_val, sizeof(int)),
+  };
+
   vkapi::SpecVarList spec_vars = {
       graph.hashed_layout_of(output),
       graph.hashed_layout_of(input),
@@ -128,7 +119,9 @@ void add_dequantize_per_tensor_node(
       default_pick_global_wg_size,
       default_pick_local_wg_size,
       // Inputs and Outputs
-      {{output, vkapi::kWrite}, {input, vkapi::kRead}},
+      {{output, vkapi::kWrite},
+       {input, vkapi::kRead},
+       {{scale, zero_point}, vkapi::kRead}},
       // Shader param buffers
       param_ubos,
       // Push Constants
@@ -517,7 +510,7 @@ void dequantize_per_channel_impl(
 
 REGISTER_OPERATORS {
   VK_REGISTER_OP(
-      quantized_decomposed.dequantize_per_tensor.default,
+      quantized_decomposed.dequantize_per_tensor.tensor,
       dequantize_per_tensor_impl);
   VK_REGISTER_OP(
       quantized_decomposed.dequantize_per_token.default,