[Bug] Invalid escape sequence

Issue Description

The docstring of energy_score_empirical (https://github.com/pyro-ppl/pyro/blob/1.9.1/pyro/ops/stats.py#L527) uses \ge (LaTeX for ≥) inside a regular (non-raw) string literal, which is an invalid Python escape sequence:

Environment

• OS: macOS
• Python version: tested 3.10-3.14
• PyTorch version: 2.9.1
• Pyro version: 1.9.1

Code Snippet

import warnings

warnings.filterwarnings("error")

import pyro.ops.stats

SyntaxError: invalid escape sequence '\g'