Define embedding_4bit ops

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Author: larryliu0820

examples/models/llama2/custom_ops/op_sdpa.cpp

@@ -240,7 +240,6 @@ void cpu_flash_attention(
       " and num kv heads=%" PRId64,
       num_head,
       num_heads_kv);
-
   int64_t num_reps = num_head / num_heads_kv;
 
   bool has_attn_mask = attn_mask.has_value() && attn_mask.value().numel();

examples/models/llama2/export_llama_lib.py

@@ -29,7 +29,7 @@
     Transformer,
 )
 from executorch.exir.backend.backend_details import CompileSpec
-from executorch.exir.passes import *
+
 from executorch.sdk.etrecord import generate_etrecord
 from executorch.util.activation_memory_profiler import generate_memory_trace
 from sentencepiece import SentencePieceProcessor

exir/passes/_quant_patterns_and_replacements.py

@@ -189,7 +189,7 @@ def embedding_byte_dtype_out_meta(
 
 quantized_decomposed_lib.define(
     "embedding_4bit.dtype_out(Tensor weight, Tensor weight_scales, Tensor? weight_zero_points, "
-    "int weight_quant_min, int weight_quant_max, Tensor indices, ScalarType? dtype=None, *, Tensor(a!) out) -> Tensor(a!)",
+    "int weight_quant_min, int weight_quant_max, Tensor indices, *, ScalarType? dtype=None, Tensor(a!) out) -> Tensor(a!)",
 )