implemented graph style selection from PyVis and NetworkX

viewer.py

@@ -3,10 +3,12 @@ from __future__ import annotations
 import json
 from pathlib import Path
 
+import matplotlib.pyplot as plt
+import networkx as nx
 import streamlit as st
 import torch
 from torch_geometric.data import Data
-from torch_geometric.utils import is_undirected
+from torch_geometric.utils import is_undirected, to_networkx
 
 DATA_DIR = Path("data")
 DEFAULT_SUBSETS = ("ba_shapes", "tree_cycle", "tree_grid", "ba_two_motifs")
@@ -137,6 +139,47 @@ def _graph_html(graph: Data, layout_seed: int) -> str:
     return net.generate_html()
 
 
+def _plot_graph(graph: Data, layout_seed: int) -> plt.Figure:
+    if not is_undirected(graph.edge_index):
+        raise ValueError("The generated graph is not undirected.")
+
+    G = to_networkx(graph, to_undirected=True)
+    pos = nx.spring_layout(G, seed=layout_seed)
+
+    node_mask = getattr(graph, "node_mask", None)
+    motif_nodes = node_mask.nonzero(as_tuple=True)[0].tolist()
+    normal_nodes = [n for n in G.nodes if n not in motif_nodes]
+
+    fig, ax = plt.subplots(figsize=(6, 6))
+    nx.draw_networkx_nodes(G, pos, nodelist=normal_nodes, node_color="skyblue", node_size=120, ax=ax)
+    nx.draw_networkx_nodes(G, pos, nodelist=motif_nodes, node_color="orange", node_size=120, ax=ax)
+    nx.draw_networkx_edges(G, pos, alpha=0.3, ax=ax)
+
+    labels = {n: str(n) for n in G.nodes()}
+    if normal_nodes:
+        nx.draw_networkx_labels(
+            G,
+            pos,
+            labels={n: labels[n] for n in normal_nodes},
+            font_size=10,
+            font_color="black",
+            ax=ax,
+        )
+    if motif_nodes:
+        nx.draw_networkx_labels(
+            G,
+            pos,
+            labels={n: labels[n] for n in motif_nodes},
+            font_size=10,
+            font_color="black",
+            ax=ax,
+        )
+
+    ax.axis("off")
+    fig.tight_layout()
+    return fig
+
+
 def main() -> None:
     st.set_page_config(page_title="MotifQA Graph Viewer", layout="wide")
     st.title("MotifQA Graph Viewer")
@@ -174,14 +217,22 @@ def main() -> None:
         value=0,
         step=1,
     )
-    layout_seed = st.sidebar.number_input("Layout seed", min_value=0, value=42, step=1)
+    st.sidebar.divider()
+    st.sidebar.markdown("### Visualization Settings")
+    viz_method = st.sidebar.radio("Visualization method", ["Interactive (PyVis)", "Static (NetworkX)"], index=0)
     example = examples[sample_idx]
     graph = _build_graph(example)
 
     left, right = st.columns([2, 1])
     with left:
-        html = _graph_html(graph, layout_seed=layout_seed)
-        st.components.v1.html(html, height=700, scrolling=True)
+        if viz_method == "Static (NetworkX)":
+            layout_seed = st.sidebar.number_input("Layout seed", min_value=0, value=42, step=1)
+            fig = _plot_graph(graph, layout_seed=layout_seed)
+            st.pyplot(fig, clear_figure=True)
+            plt.close(fig)
+        else:
+            html = _graph_html(graph, layout_seed=42)
+            st.components.v1.html(html, height=700, scrolling=True)
 
     with right:
         st.subheader("Sample details")