fix import

guidance/models/_model.py

@@ -14,7 +14,7 @@
 import time
 import numpy as np
 import logging
-from guidance import cpp
+from .. import cpp
 from .._utils import ByteTrie, log_softmax, softmax
 from .._parser import EarleyCommitParser
 from .._grammar import StatelessFunction, string, _call_pool, _tag_pattern, Null, replace_model_variables, unreplace_model_variables, select, Terminal

setup.py

@@ -5,8 +5,8 @@
 try:
     from pybind11.setup_helpers import Pybind11Extension, build_ext
 except ImportError:
-    from setuptools import build_ext, Extension as Pybind11Extension
-    build_ext = None
+    from setuptools import Extension as Pybind11Extension
+    from setuptools.command import build_ext
 
 here = os.path.abspath(os.path.dirname(__file__))