| |
|
|
| import argparse |
| import json |
| from pathlib import Path |
| from typing import List |
|
|
| import matplotlib |
|
|
| matplotlib.use("Agg") |
| import matplotlib.pyplot as plt |
| import numpy as np |
|
|
|
|
| def load_mean_change_rates(json_path: Path) -> List[float]: |
| with json_path.open("r") as f: |
| payload = json.load(f) |
|
|
| if isinstance(payload, dict) and isinstance(payload.get("mean_change_rates"), list): |
| rates = payload["mean_change_rates"] |
| elif isinstance(payload, dict) and isinstance(payload.get("tokens"), list): |
| rates = [float(item["mean_change_rate"]) for item in payload["tokens"]] |
| else: |
| raise ValueError(f"Cannot find per-token mean change rates in {json_path}") |
|
|
| rates = [float(value) for value in rates if np.isfinite(value)] |
| if not rates: |
| raise ValueError(f"No valid mean change rates found in {json_path}") |
| return rates |
|
|
|
|
| def plot_density( |
| rates: List[float], |
| output_path: Path, |
| bins: int, |
| chunk_idx: int, |
| ) -> None: |
| fig, ax = plt.subplots(figsize=(8, 5)) |
| ax.hist(rates, bins=bins, density=True, color="#4C78A8", alpha=0.85, edgecolor="white", linewidth=0.5) |
| ax.set_xlabel("Mean L2 norm change rate") |
| ax.set_ylabel("Density") |
| ax.set_title(f"Chunk {chunk_idx} token heterogeneity (n={len(rates)} tokens)") |
| ax.grid(True, alpha=0.25, linestyle="--", linewidth=0.5) |
| fig.tight_layout() |
| output_path.parent.mkdir(parents=True, exist_ok=True) |
| fig.savefig(output_path, dpi=160) |
| plt.close(fig) |
|
|
|
|
| def main() -> None: |
| parser = argparse.ArgumentParser( |
| description="Plot per-token mean L2 norm change-rate density for one chunk." |
| ) |
| parser.add_argument( |
| "json_path", |
| type=Path, |
| help="Path to token L2 change-rate stats JSON saved by --token_l2_change_rate_stats_path.", |
| ) |
| parser.add_argument("-o", "--output", type=Path, required=True, help="Output image path.") |
| parser.add_argument("--bins", type=int, default=50, help="Number of histogram bins.") |
| parser.add_argument( |
| "--chunk-idx", |
| type=int, |
| default=None, |
| help="Chunk index for plot title. Defaults to target_generated_chunk_idx in JSON.", |
| ) |
| args = parser.parse_args() |
|
|
| with args.json_path.open("r") as f: |
| payload = json.load(f) |
| chunk_idx = args.chunk_idx |
| if chunk_idx is None: |
| chunk_idx = int(payload.get("target_generated_chunk_idx", 0)) |
|
|
| rates = load_mean_change_rates(args.json_path) |
| plot_density(rates, args.output, bins=args.bins, chunk_idx=chunk_idx) |
| print(f"Saved density plot to {args.output}") |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
