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add projection with witnesses

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expose model based projection with witness creation
This commit is contained in:
Nikolaj Bjorner 2024-11-27 10:26:18 -08:00
parent b7b611d84b
commit d2411567b5
6 changed files with 106 additions and 13 deletions
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31
src/api/python/z3/z3.py
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@ -6732,6 +6732,30 @@ class ModelRef(Z3PPObject):
model = Z3_model_translate(self.ctx.ref(), self.model, target.ref())
return ModelRef(model, target)
def project(self, vars, fml):
"""Perform model-based projection on fml with respect to vars.
Assume that the model satisfies fml. Then compute a projection fml_p, such
that vars do not occur free in fml_p, fml_p is true in the model and
fml_p => exists vars . fml
"""
ctx = self.ctx.ref()
_vars = (Ast * len(vars))()
for i in range(len(vars)):
_vars[i] = vars[i].as_ast()
return _to_expr_ref(Z3_qe_model_project(ctx, self.model, len(vars), _vars, fml.ast), self.ctx)
def project_with_witness(self, vars, fml):
"""Perform model-based projection, but also include realizer terms for the projected variables"""
ctx = self.ctx.ref()
_vars = (Ast * len(vars))()
for i in range(len(vars)):
_vars[i] = vars[i].as_ast()
defs = AstMap()
result = Z3_qe_model_project_with_witness(ctx, self.model, len(vars), _vars, fml.ast, defs.map)
result = _to_expr_ref(result, self.ctx)
return result, defs
def __copy__(self):
return self.translate(self.ctx)
@ -6739,9 +6763,12 @@ class ModelRef(Z3PPObject):
return self.translate(self.ctx)
def Model(ctx=None):
def Model(ctx=None, eval = {}):
ctx = _get_ctx(ctx)
return ModelRef(Z3_mk_model(ctx.ref()), ctx)
mdl = ModelRef(Z3_mk_model(ctx.ref()), ctx)
for k, v in eval.items():
mdl.update_value(k, v)
return mdl
def is_as_array(n):