CG-10395: Identify and Fix Import Loops Pytorch Repo (#32)

adding pytorch example

Author: tawsifkamal

.pre-commit-config.yaml

@@ -26,10 +26,10 @@ repos:
         types_or: [python, jupyter, pyi]
         exclude: *exclude_patterns
 
-  - repo: https://github.com/kynan/nbstripout
-    rev: 0.8.1
-    hooks:
-      - id: nbstripout
+  # - repo: https://github.com/kynan/nbstripout
+  #   rev: 0.8.1
+  #   hooks:
+  #     - id: nbstripout
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v5.0.0
@@ -62,6 +62,8 @@ repos:
         additional_dependencies:
           - tomli
         files: ".*"
+        exclude: ".*\\.ipynb"
+
 
   - repo: https://github.com/astral-sh/uv-pre-commit
     rev: "0.5.24"

examples/removing_import_loops_in_pytorch/import_loops.ipynb

@@ -0,0 +1,65 @@
+def visualize_graph(graph):
+    """
+    Visualize SCC using Graphviz with a strictly enforced circular layout
+    """
+    import pygraphviz as pgv
+
+    # Create a new pygraphviz graph directly (instead of converting)
+    A = pgv.AGraph(strict=False, directed=True)
+
+    # Set graph attributes for strict circular layout
+    A.graph_attr.update(
+        {
+            "layout": "circo",
+            "root": "circle",
+            "splines": "curved",
+            "overlap": "false",
+            "sep": "+25,25",
+            "pad": "0.5",
+            "ranksep": "2.0",
+            "nodesep": "0.8",
+            "mindist": "2.0",
+            "start": "regular",
+            "ordering": "out",
+            "concentrate": "false",
+            "ratio": "1.0",
+        }
+    )
+
+    # Set node attributes for consistent sizing
+    A.node_attr.update({"shape": "circle", "fixedsize": "true", "width": "1.5", "height": "1.5", "style": "filled", "fillcolor": "lightblue", "fontsize": "11", "fontname": "Arial"})
+
+    # Set default edge attributes
+    A.edge_attr.update({"penwidth": "1.5", "arrowsize": "0.8", "len": "2.0", "weight": "1", "dir": "forward"})
+
+    # Add nodes first
+    for node in graph.nodes():
+        short_name = node.split("/")[-1]
+        A.add_node(node, label=short_name)
+
+    # Add edges with their attributes
+    for u, v, key, data in graph.edges(data=True, keys=True):
+        # Create a unique key for this edge
+        edge_key = f"{u}_{v}_{key}"
+
+        # Set edge attributes based on the data
+        edge_attrs = {
+            "key": edge_key,  # Ensure unique edge
+            "color": "red" if data.get("color") == "red" else "#666666",
+            "style": "dashed" if data.get("color") == "red" else "solid",
+            "label": "dynamic" if data.get("color") == "red" else "",
+            "fontcolor": "red" if data.get("color") == "red" else "#666666",
+            "fontsize": "10",
+        }
+
+        A.add_edge(u, v, **edge_attrs)
+
+    # Force circo layout with specific settings
+    A.layout(prog="circo")
+
+    # Save with a larger size
+    A.draw("import_cycle.png", format="png", prog="circo", args="-Gsize=12,12!")
+
+    from IPython.display import Image
+
+    return Image("import_cycle.png")