diff --git a/graph_net/torch/typical_sequence.py b/graph_net/torch/typical_sequence.py
new file mode 100644
index 000000000..510c7f310
--- /dev/null
+++ b/graph_net/torch/typical_sequence.py
@@ -0,0 +1,120 @@
+"""
+Typical Sequence Extractor
+Identify repeated subgraph patterns from extracted FX Graph and save them categorized.
+"""
+import argparse
+import os
+import sys
+import json
+import hashlib
+import ast
+import copy
+from pathlib import Path
+from typing import List, Dict, Tuple, Set, Any
+from graph_net.torch.rp_expr.rp_expr_parser import RpExprParser
+from graph_net.torch.rp_expr.rp_expr_util import (
+    MakeNestedIndexRangeFromLetsListTokenRpExpr,
+)
+
+
+def _get_leaf_model_pathes(src_model_path: str):
+    # Traverse all submodule (features.0, classifier.6) in src_model_path
+    return
+
+
+def _get_fx_graph(leaf_model_path: str):
+    # Load the GraphModule and extract its fx.Graph
+    return
+
+
+def _get_fx_node(fx_graph: str):
+    # Traverse fx_graph.nodes to obtain all Nodes (splaceholder, call_function, output)
+    return
+
+
+def encode_node_to_stmt_token_id(node: str):
+    # Node is encoded as token_id, representing a certain pattern
+    return
+
+
+def SequenceUnittestsGenerator(
+    program_id: str, seq_stmts: List[str], dist_model_path: str
+):
+    # Generate unittests for each sequence
+    return
+
+
+def extract_typical_sequences(src_model_path: str, dist_model_path: str, dynamic=True):
+    # Extract fx_graphs from src_model_path,  type: fx.graphmodule
+    fx_graphs = [
+        fx_graph
+        for leaf_model_path in _get_leaf_model_pathes(src_model_path)
+        for fx_graph in [_get_fx_graph(leaf_model_path)]
+    ]
+
+    # Convert each fx.Graph into a sequence of stmt token_ids
+    stmt_token_ids = [
+        [
+            stmt_token_id
+            for node in _get_fx_node(fx_graph)
+            for stmt_token_id in [encode_node_to_stmt_token_id(node)]
+        ]
+        for fx_graph in fx_graphs
+    ]
+
+    # Extract typical subgraph patterns by RpExprParser
+    parser = RpExprParser(window_size=64)
+    lets_list_rp_expr, token_id2primitive_id = parser(stmt_token_ids)
+
+    # Map the pattern back to the original FX Node range
+    trees = MakeNestedIndexRangeFromLetsListTokenRpExpr(lets_list_rp_expr)
+
+    # Filter by length
+    ranges_list = [
+        tree.FilterSubTreeRangeBySize(min_length=2, max_length=33) for tree in trees
+    ]
+
+    # get (program_id, seq_stmts) pair
+    program_seq_stmts_list = (
+        (program_id, seq_stmts)
+        for ranges, pair in zip(ranges_list, stmt_token_ids)
+        for start, end in ranges
+        for program_id, origin_seq_stmts in [pair]
+        for seq_stmts in [origin_seq_stmts[start:end]]
+    )
+
+    # Generate unittests for each sequence
+    # Each folder: subgraph_<hash_id>_<count_id>.py
+    SequenceUnittestsGenerator(program_id, seq_stmts, dist_model_path)
+
+    return
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--src_model_path", type=str, default="samples/torchvision/alexnet"
+    )
+    parser.add_argument("--dist_model_path", type=str)
+    args = parser.parse_args()
+
+    # mkdir for dist model path; diff with src model path
+    # Except:  src_model_path: GraphNet/samples/torchvision/alexnet
+    #          dist_model_path: GraphNet/subgraphs/torchvision/alexnet
+    if not args.dist_model_path:
+        components = args.src_model_path.split(os.sep)
+        try:
+            samples_index = components.index("samples")
+            components[samples_index] = "subgraphs"
+        except ValueError:
+            print(
+                "Warning: 'samples' not found in src_model_path. Using default structure for dist_model_path."
+            )
+            components.insert(2, "subgraphs")
+        args.dist_model_path = os.sep.join(components)
+    os.makedirs(os.path.dirname(args.dist_model_path), exist_ok=True)
+
+    # extract_typical_sequences(args.src_model_path, args.dist_model_path)
+
+    print("Source model path:", args.src_model_path)
+    print("Distribution model path:", args.dist_model_path)