Add GPTQ quantization to executorch (not tested) (#2274)

Summary:
Pull Request resolved: #2274

will test in OSS and fix issues in a separate PR

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Reviewed By: digantdesai

Differential Revision: D54569842

fbshipit-source-id: 7c3e60833d8e144cb5842842b4f640138dfa9382

Author: jerryzh168

backends/vulkan/serialization/vulkan_graph_serialize.py

@@ -12,7 +12,6 @@
 from dataclasses import dataclass
 from typing import ClassVar, List
 
-# pyre-ignore[21]: Could not find module `executorch.exir._serialize._bindings`.
 import pkg_resources
 import torch
 
@@ -35,7 +34,6 @@ def convert_to_flatbuffer(vk_graph: VkGraph) -> bytes:
         json_path = os.path.join(d, "schema.json")
         with open(json_path, "wb") as json_file:
             json_file.write(vk_graph_json.encode("ascii"))
-        # pyre-ignore
         _flatc_compile(d, schema_path, json_path)
         output_path = os.path.join(d, "schema.bin")
         with open(output_path, "rb") as output_file: