[BugFix] TorchScript compat

tensordict/_td.py

@@ -1334,7 +1334,7 @@ def _apply_nest(
         filter_empty: bool | None = None,
         is_leaf: Callable | None = None,
         out: TensorDictBase | None = None,
-        **constructor_kwargs,
+        **constructor_kwargs: Any,
     ) -> T | None:
         if inplace:
             result = self

tensordict/base.py

@@ -8393,7 +8393,7 @@ def func(*args, **kwargs):
 
     def map(
         self,
-        fn: Callable[[TensorDictBase], TensorDictBase | None],
+        fn: Callable,  # [[TensorDictBase], TensorDictBase | None],
         dim: int = 0,
         num_workers: int | None = None,
         *,
@@ -8573,7 +8573,7 @@ def map(
 
     def map_iter(
         self,
-        fn: Callable[[TensorDictBase], TensorDictBase | None],
+        fn: Callable,  # [[TensorDictBase], TensorDictBase | None],
         dim: int = 0,
         num_workers: int | None = None,
         *,
@@ -8771,7 +8771,7 @@ def map_iter(
 
     def _map(
         self,
-        fn: Callable[[TensorDictBase], TensorDictBase | None],
+        fn: Callable,  # [[TensorDictBase], TensorDictBase | None],
         dim: int = 0,
         *,
         shuffle: bool = False,

test/test_fx.py

@@ -4,16 +4,58 @@
 # LICENSE file in the root directory of this source tree.
 
 import argparse
+import inspect
 
 import pytest
 import torch
 import torch.nn as nn
 
 from tensordict import TensorDict
-from tensordict.nn import TensorDictModule, TensorDictSequential
+from tensordict.nn import TensorDictModule as Mod, TensorDictSequential as Seq
 from tensordict.prototype.fx import symbolic_trace
 
 
+def test_fx():
+    seq = Seq(
+        Mod(lambda x: x + 1, in_keys=["x"], out_keys=["y"]),
+        Mod(lambda x, y: (x * y).sqrt(), in_keys=["x", "y"], out_keys=["z"]),
+        Mod(lambda z, x: z - z, in_keys=["z", "x"], out_keys=["a"]),
+    )
+    symbolic_trace(seq)
+
+
+class TestModule(torch.nn.Module):
+    def __init__(self):
+        super().__init__()
+        self.linear = torch.nn.Linear(2, 2)
+
+    def forward(self, td: TensorDict) -> torch.Tensor:
+        vals = td.values()  # pyre-ignore[6]
+        return torch.cat([val._values for val in vals], dim=0)
+
+
+def test_td_scripting() -> None:
+    for cls in (TensorDict,):
+        for name in dir(cls):
+            method = inspect.getattr_static(cls, name)
+            if isinstance(method, classmethod):
+                continue
+            elif isinstance(method, staticmethod):
+                continue
+            elif not callable(method):
+                continue
+            elif not name.startswith("__") or name in ("__init__", "__setitem__"):
+                setattr(cls, name, torch.jit.unused(method))
+
+    m = TestModule()
+    td = TensorDict(
+        a=torch.nested.nested_tensor([torch.ones((1,))], layout=torch.jagged)
+    )
+    m(td)
+    m = torch.jit.script(m, example_inputs=(td,))
+    m.code
+
+
 def test_tensordictmodule_trace_consistency():
     class Net(nn.Module):
         def __init__(self):
@@ -24,7 +66,7 @@ def forward(self, x):
             logits = self.linear(x)
             return logits, torch.sigmoid(logits)
 
-    module = TensorDictModule(
+    module = Mod(
         Net(),
         in_keys=["input"],
         out_keys=[("outputs", "logits"), ("outputs", "probabilities")],
@@ -63,15 +105,13 @@ class Masker(nn.Module):
         def forward(self, x, mask):
             return torch.softmax(x * mask, dim=1)
 
-    net = TensorDictModule(
-        Net(), in_keys=[("input", "x")], out_keys=[("intermediate", "x")]
-    )
-    masker = TensorDictModule(
+    net = Mod(Net(), in_keys=[("input", "x")], out_keys=[("intermediate", "x")])
+    masker = Mod(
         Masker(),
         in_keys=[("intermediate", "x"), ("input", "mask")],
         out_keys=[("output", "probabilities")],
     )
-    module = TensorDictSequential(net, masker)
+    module = Seq(net, masker)
     graph_module = symbolic_trace(module)
 
     tensordict = TensorDict(
@@ -120,13 +160,11 @@ def forward(self, x):
     module2 = Net(50, 40)
     module3 = Output(40, 10)
 
-    tdmodule1 = TensorDictModule(module1, ["input"], ["x"])
-    tdmodule2 = TensorDictModule(module2, ["x"], ["x"])
-    tdmodule3 = TensorDictModule(module3, ["x"], ["probabilities"])
+    tdmodule1 = Mod(module1, ["input"], ["x"])
+    tdmodule2 = Mod(module2, ["x"], ["x"])
+    tdmodule3 = Mod(module3, ["x"], ["probabilities"])
 
-    tdmodule = TensorDictSequential(
-        TensorDictSequential(tdmodule1, tdmodule2), tdmodule3
-    )
+    tdmodule = Seq(Seq(tdmodule1, tdmodule2), tdmodule3)
     graph_module = symbolic_trace(tdmodule)
 
     tensordict = TensorDict({"input": torch.rand(32, 100)}, [32])