utils/visualization.py

import plotly.graph_objects as go
import plotly.express as px
import networkx as nx
import torch
import numpy as np

class GraphVisualizer:
    """Graph visualization utilities"""
    
    @staticmethod
    def create_graph_plot(data, max_nodes=500):
        """Create interactive graph visualization"""
        try:
            # Limit nodes for performance
            num_nodes = min(data.num_nodes, max_nodes)
            
            # Create NetworkX graph
            G = nx.Graph()
            edge_list = data.edge_index.t().cpu().numpy()
            
            # Filter edges to include only first max_nodes
            edge_list = edge_list[
                (edge_list[:, 0] < num_nodes) & (edge_list[:, 1] < num_nodes)
            ]
            
            if len(edge_list) > 0:
                G.add_edges_from(edge_list)
            
            # Add isolated nodes
            G.add_nodes_from(range(num_nodes))
            
            # Layout
            if len(G.nodes()) > 100:
                pos = nx.spring_layout(G, k=0.5, iterations=20)
            else:
                pos = nx.spring_layout(G, k=1, iterations=50)
            
            # Node colors
            if hasattr(data, 'y') and data.y is not None:
                node_colors = data.y.cpu().numpy()[:num_nodes]
            else:
                node_colors = [0] * num_nodes
            
            # Create edge traces
            edge_x, edge_y = [], []
            for edge in G.edges():
                if edge[0] in pos and edge[1] in pos:
                    x0, y0 = pos[edge[0]]
                    x1, y1 = pos[edge[1]]
                    edge_x.extend([x0, x1, None])
                    edge_y.extend([y0, y1, None])
            
            # Create node traces
            node_x = [pos[node][0] for node in G.nodes() if node in pos]
            node_y = [pos[node][1] for node in G.nodes() if node in pos]
            
            fig = go.Figure()
            
            # Add edges
            if edge_x:
                fig.add_trace(go.Scatter(
                    x=edge_x, y=edge_y,
                    line=dict(width=0.5, color='#888'),
                    hoverinfo='none',
                    mode='lines',
                    name='Edges'
                ))
            
            # Add nodes
            fig.add_trace(go.Scatter(
                x=node_x, y=node_y,
                mode='markers',
                hoverinfo='text',
                text=[f'Node {i}' for i in range(len(node_x))],
                marker=dict(
                    size=8,
                    color=node_colors[:len(node_x)],
                    colorscale='Viridis',
                    line=dict(width=1)
                ),
                name='Nodes'
            ))
            
            fig.update_layout(
                title=f'Graph Visualization ({num_nodes} nodes)',
                showlegend=False,
                hovermode='closest',
                margin=dict(b=20, l=5, r=5, t=40),
                xaxis=dict(showgrid=False, zeroline=False, showticklabels=False),
                yaxis=dict(showgrid=False, zeroline=False, showticklabels=False),
                plot_bgcolor='white'
            )
            
            return fig
            
        except Exception as e:
            # Return error plot
            fig = go.Figure()
            fig.add_annotation(
                text=f"Visualization error: {str(e)}",
                x=0.5, y=0.5,
                xref="paper", yref="paper",
                showarrow=False
            )
            return fig
    
    @staticmethod
    def create_metrics_plot(metrics):
        """Create metrics visualization"""
        try:
            metric_names = []
            metric_values = []
            
            for key, value in metrics.items():
                if isinstance(value, (int, float)) and key != 'error':
                    metric_names.append(key.replace('_', ' ').title())
                    metric_values.append(value)
            
            if metric_names:
                fig = go.Figure(data=[
                    go.Bar(
                        x=metric_names,
                        y=metric_values,
                        marker_color='lightblue'
                    )
                ])
                
                fig.update_layout(
                    title='Model Performance Metrics',
                    xaxis_title='Metric',
                    yaxis_title='Value',
                    yaxis=dict(range=[0, 1])
                )
            else:
                fig = go.Figure()
                fig.add_annotation(
                    text="No metrics to display",
                    x=0.5, y=0.5,
                    xref="paper", yref="paper",
                    showarrow=False
                )
                
            return fig
            
        except Exception as e:
            fig = go.Figure()
            fig.add_annotation(
                text=f"Metrics plot error: {str(e)}",
                x=0.5, y=0.5,
                xref="paper", yref="paper",
                showarrow=False
            )
            return fig