Update Down/run_all.py

Down/run_all.py

@@ -11,6 +11,10 @@ This will:
 
 from __future__ import annotations
 
+# Headless-safe plotting (Hugging Face / Linux without DISPLAY)
+import matplotlib
+matplotlib.use("Agg")
+
 import argparse
 import os
 import subprocess
@@ -36,25 +40,31 @@ def main() -> None:
     graphics_dir = root / "graphics"
     results_dir.mkdir(parents=True, exist_ok=True)
     graphics_dir.mkdir(parents=True, exist_ok=True)
+
+    # Common env for all subprocesses (plots must be headless-safe)
     common_env = {
         "TWOQUARKS_RESULTS_DIR": results_dir.as_posix(),
         "TWOQUARKS_GRAPHICS_DIR": graphics_dir.as_posix(),
+        "MPLBACKEND": "Agg",  # <-- critical for HF headless plotting
     }
+
     down_dir = root / "down"
     AntiDown_dir = root / "AntiDown"
 
     # DOWN
     down_script = down_dir / "exp" / "run_paradox_tabular.py"
     _run([sys.executable, str(down_script)], cwd=down_dir, env=common_env)
+
     plot_script = down_dir / "exp" / "plot_paradox_results.py"
     _run([sys.executable, str(plot_script)], cwd=down_dir, env=common_env)
+
     # AntiDown
     AntiDown_script = AntiDown_dir / "exp" / "run_corrupted_valley_tabular.py"
     _run([sys.executable, str(AntiDown_script)], cwd=AntiDown_dir, env=common_env)
+
     AntiDown_plot = AntiDown_dir / "exp" / "plot_corrupted_valley_results.py"
     _run([sys.executable, str(AntiDown_plot)], cwd=AntiDown_dir, env=common_env)
 
-
     # Dual overlay plot (Down vs AntiDown)
     dual_plot = root / "plot_dual_down_antidown.py"
     if dual_plot.exists():