Fix support for dataclasses with ClassVar/InitVar in `apply_to_collec…

…tion` (#9702)

Co-authored-by: Adrian Wälchli <[email protected]>
Co-authored-by: Carlos Mocholi <[email protected]>

CHANGELOG.md

@@ -10,7 +10,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 ### Fixed
 
 - Fixed `CombinedLoader` and `max_size_cycle` didn't receive a `DistributedSampler` ([#10374](https://github.com/PyTorchLightning/pytorch-lightning/issues/10374))
-
+- Fixed an issue where class or init-only variables of dataclasses were passed to the dataclass constructor in `utilities.apply_to_collection` ([#9702](https://github.com/PyTorchLightning/pytorch-lightning/issues/9702))
 
 
 ## [1.5.1] - 2021-11-09

pytorch_lightning/trainer/connectors/logger_connector/result.py

@@ -51,8 +51,8 @@ class _Sync:
     fn: Optional[Callable] = None
     _should: bool = False
     rank_zero_only: bool = False
-    op: Optional[str] = None
-    group: Optional[Any] = None
+    _op: Optional[str] = None
+    _group: Optional[Any] = None
 
     def __post_init__(self) -> None:
         self._generate_sync_fn()
@@ -67,6 +67,26 @@ def should(self, should: bool) -> None:
         # `self._fn` needs to be re-generated.
         self._generate_sync_fn()
 
+    @property
+    def op(self) -> Optional[str]:
+        return self._op
+
+    @op.setter
+    def op(self, op: Optional[str]) -> None:
+        self._op = op
+        # `self._fn` needs to be re-generated.
+        self._generate_sync_fn()
+
+    @property
+    def group(self) -> Optional[Any]:
+        return self._group
+
+    @group.setter
+    def group(self, group: Optional[Any]) -> None:
+        self._group = group
+        # `self._fn` needs to be re-generated.
+        self._generate_sync_fn()
+
     def _generate_sync_fn(self) -> None:
         """Used to compute the syncing function and cache it."""
         fn = self.no_op if self.fn is None or not self.should or self.rank_zero_only else self.fn
@@ -426,7 +446,7 @@ def log(
             dataloader_idx=dataloader_idx,
             metric_attribute=metric_attribute,
         )
-        meta.sync = _Sync(_should=sync_dist, fn=sync_dist_fn, group=sync_dist_group, rank_zero_only=rank_zero_only)
+        meta.sync = _Sync(_should=sync_dist, fn=sync_dist_fn, _group=sync_dist_group, rank_zero_only=rank_zero_only)
 
         # register logged value if it doesn't exist
         if key not in self:

pytorch_lightning/utilities/apply_func.py

@@ -16,7 +16,7 @@
 from abc import ABC
 from collections import defaultdict, OrderedDict
 from collections.abc import Mapping, Sequence
-from copy import copy
+from copy import copy, deepcopy
 from functools import partial
 from typing import Any, Callable, List, Optional, Tuple, Union
 
@@ -119,21 +119,32 @@ def apply_to_collection(
         return elem_type(*out) if is_namedtuple else elem_type(out)
 
     if _is_dataclass_instance(data):
-        out_dict = {}
+        # make a deepcopy of the data,
+        # but do not deepcopy mapped fields since the computation would
+        # be wasted on values that likely get immediately overwritten
+        fields = {}
+        memo = {}
         for field in dataclasses.fields(data):
-            if field.init:
+            field_value = getattr(data, field.name)
+            fields[field.name] = (field_value, field.init)
+            memo[id(field_value)] = field_value
+        result = deepcopy(data, memo=memo)
+        # apply function to each field
+        for field_name, (field_value, field_init) in fields.items():
+            if field_init:
                 v = apply_to_collection(
-                    getattr(data, field.name),
+                    field_value,
                     dtype,
                     function,
                     *args,
                     wrong_dtype=wrong_dtype,
                     include_none=include_none,
                     **kwargs,
                 )
-                if include_none or v is not None:
-                    out_dict[field.name] = v
-        return elem_type(**out_dict)
+            if not field_init or (not include_none and v is None):  # retain old value
+                v = getattr(data, field_name)
+            setattr(result, field_name, v)
+        return result
 
     # data is neither of dtype, nor a collection
     return data

tests/core/test_results.py

@@ -33,7 +33,7 @@ def _setup_ddp(rank, worldsize):
 def _ddp_test_fn(rank, worldsize):
     _setup_ddp(rank, worldsize)
     tensor = torch.tensor([1.0])
-    sync = _Sync(sync_ddp_if_available, _should=True, op="SUM")
+    sync = _Sync(sync_ddp_if_available, _should=True, _op="SUM")
     actual = sync(tensor)
     assert actual.item() == dist.get_world_size(), "Result-Log does not work properly with DDP and Tensors"
 

tests/models/test_tpu.py

@@ -407,7 +407,7 @@ def test_tpu_sync_dist():
     """Test tpu spawn sync dist operation."""
 
     def test_sync_dist(_):
-        sync = _Sync(TPUSpawnPlugin().reduce, should=True, op=torch.distributed.ReduceOp.SUM)
+        sync = _Sync(TPUSpawnPlugin().reduce, should=True, _op=torch.distributed.ReduceOp.SUM)
         value = torch.tensor([1.0])
         value = (sync(value),)
         assert value.item() == 8

tests/utilities/test_apply_func.py

@@ -14,7 +14,8 @@
 import dataclasses
 import numbers
 from collections import defaultdict, namedtuple, OrderedDict
-from typing import List
+from dataclasses import InitVar
+from typing import Any, ClassVar, List, Optional
 
 import numpy as np
 import pytest
@@ -31,6 +32,12 @@ class Feature:
         input_ids: torch.Tensor
         segment_ids: np.ndarray
 
+        def __eq__(self, o: object) -> bool:
+            if not isinstance(o, Feature):
+                return NotImplemented
+            else:
+                return torch.equal(self.input_ids, o.input_ids) and np.equal(self.segment_ids, o.segment_ids).all()
+
     @dataclasses.dataclass
     class ModelExample:
         example_ids: List[str]
@@ -41,6 +48,71 @@ class ModelExample:
         def __post_init__(self):
             self.some_constant = 7
 
+        def __eq__(self, o: object) -> bool:
+            if not isinstance(o, ModelExample):
+                return NotImplemented
+            else:
+                return (
+                    self.example_ids == o.example_ids
+                    and self.feature == o.feature
+                    and torch.equal(self.label, o.label)
+                    and self.some_constant == o.some_constant
+                )
+
+    @dataclasses.dataclass
+    class WithClassVar:
+        class_var: ClassVar[int] = 0
+        dummy: Any
+
+        def __eq__(self, o: object) -> bool:
+            if not isinstance(o, WithClassVar):
+                return NotImplemented
+            elif isinstance(self.dummy, torch.Tensor):
+                return torch.equal(self.dummy, o.dummy)
+            else:
+                return self.dummy == o.dummy
+
+    @dataclasses.dataclass
+    class WithInitVar:
+        dummy: Any
+        override: InitVar[Optional[Any]] = None
+
+        def __post_init__(self, override: Optional[Any]):
+            if override is not None:
+                self.dummy = override
+
+        def __eq__(self, o: object) -> bool:
+            if not isinstance(o, WithInitVar):
+                return NotImplemented
+            elif isinstance(self.dummy, torch.Tensor):
+                return torch.equal(self.dummy, o.dummy)
+            else:
+                return self.dummy == o.dummy
+
+    @dataclasses.dataclass
+    class WithClassAndInitVar:
+        class_var: ClassVar[torch.Tensor] = torch.tensor(0)
+        dummy: Any
+        override: InitVar[Optional[Any]] = torch.tensor(1)
+
+        def __post_init__(self, override: Optional[Any]):
+            if override is not None:
+                self.dummy = override
+
+        def __eq__(self, o: object) -> bool:
+            if not isinstance(o, WithClassAndInitVar):
+                return NotImplemented
+            elif isinstance(self.dummy, torch.Tensor):
+                return torch.equal(self.dummy, o.dummy)
+            else:
+                return self.dummy == o.dummy
+
+    model_example = ModelExample(
+        example_ids=["i-1", "i-2", "i-3"],
+        feature=Feature(input_ids=torch.tensor([1.0, 2.0, 3.0]), segment_ids=np.array([4.0, 5.0, 6.0])),
+        label=torch.tensor([7.0, 8.0, 9.0]),
+    )
+
     to_reduce = {
         "a": torch.tensor([1.0]),  # Tensor
         "b": [torch.tensor([2.0])],  # list
@@ -50,13 +122,18 @@ def __post_init__(self):
         "f": "this_is_a_dummy_str",  # string
         "g": 12.0,  # number
         "h": Feature(input_ids=torch.tensor([1.0, 2.0, 3.0]), segment_ids=np.array([4.0, 5.0, 6.0])),  # dataclass
-        "i": ModelExample(
-            example_ids=["i-1", "i-2", "i-3"],
-            feature=Feature(input_ids=torch.tensor([1.0, 2.0, 3.0]), segment_ids=np.array([4.0, 5.0, 6.0])),
-            label=torch.tensor([7.0, 8.0, 9.0]),
-        ),  # nested dataclass
+        "i": model_example,  # nested dataclass
+        "j": WithClassVar(torch.arange(3)),  # dataclass with class variable
+        "k": WithInitVar("this_gets_overridden", torch.tensor([2.0])),  # dataclass with init-only variable
+        "l": WithClassAndInitVar(model_example, None),  # nested dataclass with class and init-only variables
     }
 
+    model_example_result = ModelExample(
+        example_ids=["i-1", "i-2", "i-3"],
+        feature=Feature(input_ids=torch.tensor([2.0, 4.0, 6.0]), segment_ids=np.array([8.0, 10.0, 12.0])),
+        label=torch.tensor([14.0, 16.0, 18.0]),
+    )
+
     expected_result = {
         "a": torch.tensor([2.0]),
         "b": [torch.tensor([4.0])],
@@ -66,32 +143,31 @@ def __post_init__(self):
         "f": "this_is_a_dummy_str",
         "g": 24.0,
         "h": Feature(input_ids=torch.tensor([2.0, 4.0, 6.0]), segment_ids=np.array([8.0, 10.0, 12.0])),
-        "i": ModelExample(
-            example_ids=["i-1", "i-2", "i-3"],
-            feature=Feature(input_ids=torch.tensor([2.0, 4.0, 6.0]), segment_ids=np.array([8.0, 10.0, 12.0])),
-            label=torch.tensor([14.0, 16.0, 18.0]),
-        ),
+        "i": model_example_result,
+        "j": WithClassVar(torch.arange(0, 6, 2)),
+        "k": WithInitVar(torch.tensor([4.0])),
+        "l": WithClassAndInitVar(model_example_result, None),
     }
 
     reduced = apply_to_collection(to_reduce, (torch.Tensor, numbers.Number, np.ndarray), lambda x: x * 2)
 
-    assert isinstance(reduced, dict), " Type Consistency of dict not preserved"
+    assert isinstance(reduced, dict), "Type Consistency of dict not preserved"
     assert all(x in reduced for x in to_reduce), "Not all entries of the dict were preserved"
     assert all(
         isinstance(reduced[k], type(expected_result[k])) for k in to_reduce
     ), "At least one type was not correctly preserved"
 
     assert isinstance(reduced["a"], torch.Tensor), "Reduction Result of a Tensor should be a Tensor"
-    assert torch.allclose(expected_result["a"], reduced["a"]), "Reduction of a tensor does not yield the expected value"
+    assert torch.equal(expected_result["a"], reduced["a"]), "Reduction of a tensor does not yield the expected value"
 
     assert isinstance(reduced["b"], list), "Reduction Result of a list should be a list"
     assert all(
-        torch.allclose(x, y) for x, y in zip(reduced["b"], expected_result["b"])
+        torch.equal(x, y) for x, y in zip(reduced["b"], expected_result["b"])
     ), "At least one value of list reduction did not come out as expected"
 
     assert isinstance(reduced["c"], tuple), "Reduction Result of a tuple should be a tuple"
     assert all(
-        torch.allclose(x, y) for x, y in zip(reduced["c"], expected_result["c"])
+        torch.equal(x, y) for x, y in zip(reduced["c"], expected_result["c"])
     ), "At least one value of tuple reduction did not come out as expected"
 
     assert isinstance(reduced["d"], ntc), "Type Consistency for named tuple not given"
@@ -109,34 +185,30 @@ def __post_init__(self):
     assert isinstance(reduced["g"], numbers.Number), "Reduction of a number should result in a number"
     assert reduced["g"] == expected_result["g"], "Reduction of a number did not yield the desired result"
 
-    assert dataclasses.is_dataclass(reduced["h"]) and not isinstance(
-        reduced["h"], type
-    ), "Reduction of a dataclass should result in a dataclass"
-    assert torch.allclose(
-        reduced["h"].input_ids, expected_result["h"].input_ids
-    ), "Reduction of a dataclass did not yield the desired result"
-    assert np.allclose(
-        reduced["h"].segment_ids, expected_result["h"].segment_ids
-    ), "Reduction of a dataclass did not yield the desired result"
-
-    assert dataclasses.is_dataclass(reduced["i"]) and not isinstance(
-        reduced["i"], type
-    ), "Reduction of a dataclass should result in a dataclass"
-    assert dataclasses.is_dataclass(reduced["i"].feature) and not isinstance(
-        reduced["i"].feature, type
-    ), "Reduction of a nested dataclass should result in a nested dataclass"
-    assert (
-        reduced["i"].example_ids == expected_result["i"].example_ids
-    ), "Reduction of a nested dataclass did not yield the desired result"
-    assert torch.allclose(
-        reduced["i"].label, expected_result["i"].label
-    ), "Reduction of a nested dataclass did not yield the desired result"
-    assert torch.allclose(
-        reduced["i"].feature.input_ids, expected_result["i"].feature.input_ids
-    ), "Reduction of a nested dataclass did not yield the desired result"
-    assert np.allclose(
-        reduced["i"].feature.segment_ids, expected_result["i"].feature.segment_ids
-    ), "Reduction of a nested dataclass did not yield the desired result"
+    def _assert_dataclass_reduction(actual, expected, dataclass_type: str = ""):
+        assert dataclasses.is_dataclass(actual) and not isinstance(
+            actual, type
+        ), f"Reduction of a {dataclass_type} dataclass should result in a dataclass"
+        for field in dataclasses.fields(actual):
+            if dataclasses.is_dataclass(field.type):
+                _assert_dataclass_reduction(getattr(actual, field.name), getattr(expected, field.name), "nested")
+        assert actual == expected, f"Reduction of a {dataclass_type} dataclass did not yield the desired result"
+
+    _assert_dataclass_reduction(reduced["h"], expected_result["h"])
+
+    _assert_dataclass_reduction(reduced["i"], expected_result["i"])
+
+    dataclass_type = "ClassVar-containing"
+    _assert_dataclass_reduction(reduced["j"], expected_result["j"], dataclass_type)
+    assert WithClassVar.class_var == 0, f"Reduction of a {dataclass_type} dataclass should not change the class var"
+
+    _assert_dataclass_reduction(reduced["k"], expected_result["k"], "InitVar-containing")
+
+    dataclass_type = "Class-and-InitVar-containing"
+    _assert_dataclass_reduction(reduced["l"], expected_result["l"], dataclass_type)
+    assert torch.equal(
+        WithClassAndInitVar.class_var, torch.tensor(0)
+    ), f"Reduction of a {dataclass_type} dataclass should not change the class var"
 
     # mapping support
     reduced = apply_to_collection({"a": 1, "b": 2}, int, lambda x: str(x))