Allow passing `trust_input` to `function` (#1206)

pytensor/compile/debugmode.py

@@ -1966,6 +1966,12 @@ class _Maker(FunctionMaker):  # inheritance buys a few helper functions
         If the outputs argument for pytensor.function was a list, then
         output_keys is None. If the outputs argument was a dict, then
         output_keys is a sorted list of the keys from that dict.
+    trust_input : bool, default False
+        If True, no input validation checks are performed when the function is
+        called. This includes checking the number of inputs, their types and
+        that multiple inputs are not aliased to each other. Failure to meet any
+        of these conditions can lead to computational errors or to the
+        interpreter crashing.
 
     Notes
     -----
@@ -1993,6 +1999,7 @@ class _Maker(FunctionMaker):  # inheritance buys a few helper functions
         output_keys=None,
         name=None,
         no_fgraph_prep=False,
+        trust_input=False,
     ):
         self.mode = mode
         self.profile = profile
@@ -2146,6 +2153,7 @@ class _Maker(FunctionMaker):  # inheritance buys a few helper functions
         self.on_unused_input = on_unused_input  # Used for the pickling/copy
         self.output_keys = output_keys
         self.name = name
+        self.trust_input = trust_input
 
         self.required = [(i.value is None) for i in self.inputs]
         self.refeed = [

pytensor/compile/function/__init__.py

@@ -37,6 +37,7 @@ def function_dump(
     profile: bool | ProfileStats | None = None,
     on_unused_input: str | None = None,
     extra_tag_to_remove: str | None = None,
+    trust_input: bool = False,
 ):
     """
     This is helpful to make a reproducible case for problems during PyTensor
@@ -82,6 +83,7 @@ def function_dump(
         "allow_input_downcast": allow_input_downcast,
         "profile": profile,
         "on_unused_input": on_unused_input,
+        "trust_input": trust_input,
     }
     with Path(filename).open("wb") as f:
         pickler = pytensor.misc.pkl_utils.StripPickler(
@@ -107,6 +109,7 @@ def function(
     allow_input_downcast: bool | None = None,
     profile: bool | ProfileStats | None = None,
     on_unused_input: str | None = None,
+    trust_input: bool = False,
 ):
     """
     Return a :class:`callable object <pytensor.compile.function.types.Function>`
@@ -164,6 +167,12 @@ def function(
     on_unused_input
         What to do if a variable in the 'inputs' list is not used in the graph.
         Possible values are 'raise', 'warn', 'ignore' and None.
+    trust_input: bool, default False
+        If True, no input validation checks are performed when the function is
+        called. This includes checking the number of inputs, their types and
+        that multiple inputs are not aliased to each other. Failure to meet any
+        of these conditions can lead to computational errors or to the
+        interpreter crashing.
 
     Returns
     -------
@@ -310,7 +319,12 @@ def function(
                 "semantics, which disallow using updates and givens"
             )
         fn = orig_function(
-            inputs, outputs, mode=mode, accept_inplace=accept_inplace, name=name
+            inputs,
+            outputs,
+            mode=mode,
+            accept_inplace=accept_inplace,
+            name=name,
+            trust_input=trust_input,
         )
     else:
         # note: pfunc will also call orig_function -- orig_function is
@@ -329,5 +343,6 @@ def function(
             on_unused_input=on_unused_input,
             profile=profile,
             output_keys=output_keys,
+            trust_input=trust_input,
         )
     return fn

pytensor/compile/function/pfunc.py

@@ -377,6 +377,7 @@ def pfunc(
     on_unused_input=None,
     output_keys=None,
     fgraph: FunctionGraph | None = None,
+    trust_input: bool = False,
 ) -> Function:
     """
     Function-constructor for graphs with shared variables.
@@ -425,6 +426,12 @@ def pfunc(
     fgraph
         An existing `FunctionGraph` from which to construct the returned
         `Function`.  When this is non-``None``, nothing is cloned.
+    trust_input : bool, default False
+        If True, no input validation checks are performed when the function is
+        called. This includes checking the number of inputs, their types and
+        that multiple inputs are not aliased to each other. Failure to meet any
+        of these conditions can lead to computational errors or to the
+        interpreter crashing.
 
     Returns
     -------
@@ -472,6 +479,7 @@ def pfunc(
         on_unused_input=on_unused_input,
         output_keys=output_keys,
         fgraph=fgraph,
+        trust_input=trust_input,
     )
 
 

pytensor/compile/function/types.py

@@ -373,6 +373,7 @@ class Function:
         return_none: bool,
         output_keys,
         maker: "FunctionMaker",
+        trust_input: bool = False,
         name: str | None = None,
     ):
         """
@@ -407,6 +408,12 @@ class Function:
             TODO
         maker
             The `FunctionMaker` that created this instance.
+        trust_input : bool, default False
+            If True, no input validation checks are performed when the function is
+            called. This includes checking the number of inputs, their types and
+            that multiple inputs are not aliased to each other. Failure to meet any
+            of these conditions can lead to computational errors or to the
+            interpreter crashing.
         name
             A string name.
         """
@@ -420,7 +427,7 @@ class Function:
         self.return_none = return_none
         self.maker = maker
         self.profile = None  # reassigned in FunctionMaker.create
-        self.trust_input = False  # If True, we don't check the input parameter
+        self.trust_input = trust_input  # If True, we don't check the input parameter
         self.name = name
         self.nodes_with_inner_function = []
         self.output_keys = output_keys
@@ -1341,7 +1348,12 @@ class FunctionMaker:
     name : str
         An optional name for this function. If used, the profile mode will
         print the time spent in this function.
-
+    trust_input : bool, default False
+        If True, no input validation checks are performed when the function is
+        called. This includes checking the number of inputs, their types and
+        that multiple inputs are not aliased to each other. Failure to meet any
+        of these conditions can lead to computational errors or to the
+        interpreter crashing.
     """
 
     @staticmethod
@@ -1507,6 +1519,7 @@ class FunctionMaker:
         output_keys=None,
         name=None,
         no_fgraph_prep=False,
+        trust_input=False,
     ):
         # Save the provided mode, not the instantiated mode.
         # The instantiated mode don't pickle and if we unpickle an PyTensor
@@ -1609,6 +1622,7 @@ class FunctionMaker:
         self.on_unused_input = on_unused_input  # Used for the pickling/copy
         self.output_keys = output_keys
         self.name = name
+        self.trust_input = trust_input
 
         self.required = [(i.value is None) for i in self.inputs]
         self.refeed = [
@@ -1726,6 +1740,7 @@ class FunctionMaker:
             self.return_none,
             self.output_keys,
             self,
+            trust_input=self.trust_input,
             name=self.name,
         )
 
@@ -1743,6 +1758,7 @@ def orig_function(
     on_unused_input=None,
     output_keys=None,
     fgraph: FunctionGraph | None = None,
+    trust_input: bool = False,
 ) -> Function:
     """
     Return a Function that will calculate the outputs from the inputs.
@@ -1773,7 +1789,12 @@ def orig_function(
     fgraph
         An existing `FunctionGraph` to use instead of constructing a new one
         from cloned `outputs`.
-
+    trust_input : bool, default False
+        If True, no input validation checks are performed when the function is
+        called. This includes checking the number of inputs, their types and
+        that multiple inputs are not aliased to each other. Failure to meet any
+        of these conditions can lead to computational errors or to the
+        interpreter crashing.
     """
 
     if profile:
@@ -1806,6 +1827,7 @@ def orig_function(
             output_keys=output_keys,
             name=name,
             fgraph=fgraph,
+            trust_input=trust_input,
         )
         with config.change_flags(compute_test_value="off"):
             fn = m.create(defaults)

tests/compile/function/test_function.py

@@ -54,6 +54,16 @@ def test_function_name():
     assert regex.match(func.name) is not None
 
 
+def test_trust_input():
+    x = dvector()
+    y = shared(1)
+    z = x + y
+    f = function([x], z)
+    assert f.trust_input is False
+    f = function([x], z, trust_input=True)
+    assert f.trust_input is True
+
+
 class TestFunctionIn:
     def test_in_strict(self):
         a = dvector()