fixed errors in PR comments

Author: kobby-kobbs

initializer.py

@@ -52,22 +52,16 @@
 import abc
 import dataclasses
 import logging
-import numpy as np
 import onnx
 from onnx import helper as onnx_helper
-from onnx import NodeProto, TensorProto, helper, numpy_helper
 
 import onnxscript
 from onnxscript import ir
-from onnxscript.ir import SymbolicDim
 from onnxscript.rewriter import _ir_utils, function_rule
 
 logger = logging.getLogger(__name__)
 
-import dataclasses
-import abc
 from onnxscript import ir
-from typing import List, Tuple, Union, Optional
 
 from onnxscript.rewriter import _ir_utils, function_rule
 import onnx.shape_inference

onnxscript/rewriter/onnxruntime/transformers/multihead_attention.py

@@ -4,13 +4,8 @@
 import onnxscript.optimizer
 import onnxscript.rewriter
 from onnxscript.rewriter import onnxruntime as ort_rewriter
-from onnx import NodeProto, TensorProto, helper, external_data_helper, numpy_helper
-import numpy as np
-from onnxscript import ir
 from onnxscript.ir import convenience as ir_convenience
 
-from typing import List, Optional, Tuple, Union
-
 def export_to_onnx(input_model_path: str, output_model_path: str):
     """
     Export a model to ONNX. This is for testing your rewrite rules without accessing the initializers