[lazy] support torch 2.0 (#4763)

* [lazy] support _like methods and clamp

* [lazy] pass transformers models

* [lazy] fix device move and requires grad

* [lazy] fix requires grad and refactor api

* [lazy] fix requires grad

.isort.cfg

@@ -4,3 +4,4 @@ multi_line_output=3
 include_trailing_comma = true
 ignore_comments = true
 profile = black
+honor_noqa = true

colossalai/lazy/construction.py

@@ -0,0 +1,87 @@
+from contextlib import contextmanager
+from typing import Callable, Dict, Tuple
+
+import torch
+
+__all__ = [
+    "_LEGACY_TENSOR_CONSTRUCTOR",
+    "_NO_META_FACTORY",
+    "_NORMAL_FACTORY",
+    "ConstructorManager",
+]
+
+# reference: https://pytorch.org/cppdocs/notes/tensor_creation.html
+_NORMAL_FACTORY = [
+    "arange",
+    "full",
+    "empty",
+    "linspace",
+    "logspace",
+    "ones",
+    "rand",
+    "randn",
+    "randint",
+    "randperm",
+    "zeros",
+    "tensor",
+]
+
+# factory function that does not support meta tensor backend
+_NO_META_FACTORY = [
+    "eye",
+]
+
+_LEGACY_TENSOR_CONSTRUCTOR = {
+    "FloatTensor": torch.float,
+    "DoubleTensor": torch.double,
+    "HalfTensor": torch.half,
+    "BFloat16Tensor": torch.bfloat16,
+    "ByteTensor": torch.uint8,
+    "CharTensor": torch.int8,
+    "ShortTensor": torch.short,
+    "IntTensor": torch.int,
+    "LongTensor": torch.long,
+    "BoolTensor": torch.bool,
+}
+
+
+class ConstructorManager:
+    # function name: (new, old)
+    overwrites: Dict[str, Tuple[Callable, Callable]] = {}
+    changed: bool = False
+
+    @staticmethod
+    def apply(overwrites: Dict[Callable, Callable]):
+        ConstructorManager.overwrites.clear()
+        ConstructorManager.overwrites.update(overwrites)
+        ConstructorManager.redo()
+
+    @staticmethod
+    def undo():
+        assert ConstructorManager.changed, "No constructor change to undo"
+        for name, (new, old) in ConstructorManager.overwrites.items():
+            setattr(torch, name, old)
+        ConstructorManager.changed = False
+
+    @staticmethod
+    def redo():
+        assert not ConstructorManager.changed, "Constructor already changed"
+        for name, (new, old) in ConstructorManager.overwrites.items():
+            setattr(torch, name, new)
+        ConstructorManager.changed = True
+
+    @staticmethod
+    @contextmanager
+    def disable():
+        enabled = ConstructorManager.changed
+        if enabled:
+            ConstructorManager.undo()
+        yield
+        if enabled:
+            ConstructorManager.redo()
+
+    @staticmethod
+    def clear():
+        if ConstructorManager.changed:
+            ConstructorManager.undo()
+        ConstructorManager.overwrites.clear()

colossalai/lazy/lazy_init.py

@@ -1,17 +1,18 @@
 from types import MethodType
-from typing import Callable, Dict, Optional, Union
+from typing import Callable, Optional, Union
 
 import torch
-import torch.distributed as dist
 import torch.nn as nn
+from packaging import version
 from torch import Tensor
 from torch.nn import Parameter
 from torch.utils._pytree import tree_map
 
-from colossalai._analyzer._subclasses import MetaTensor
-from colossalai.device.device_mesh import DeviceMesh
-from colossalai.tensor.d_tensor import distribute_tensor
-from colossalai.tensor.d_tensor.sharding_spec import ShardingSpec
+from colossalai.logging import get_dist_logger
+
+from .construction import ConstructorManager
+
+import colossalai._analyzer._subclasses._meta_registration  # noqa
 
 # reference: https://pytorch.org/cppdocs/notes/tensor_creation.html
 _NORMAL_FACTORY = [
@@ -41,6 +42,9 @@ _EARLY_MATERIALIZED_OPS = ["__getitem__", "split"]
 # These ops cannot be unwrapped using .data
 _CHANGE_META_OPS = ["_cudnn_rnn_flatten_weight", "requires_grad_", "__get__", "__set__", "numel", "size", "dim"]
 
+# These ops is not related to tensor value and should not be rerun
+_NO_RERUN_OPS = ["__get__", "numel", "size", "dim"]
+
 _LEGACY_TENSOR_CONSTRUCTOR = {
     "FloatTensor": torch.float,
     "DoubleTensor": torch.double,
@@ -54,6 +58,20 @@ _LEGACY_TENSOR_CONSTRUCTOR = {
     "BoolTensor": torch.bool,
 }
 
+# These ops have at least one lazy tensor argument and maybe a scalar argument
+# scalar value should be converted to meta tensor
+# this is a hack for torch 2.0
+_EXPAND_SCALAR_OPS = [
+    "where",
+    "clamp",
+    "clamp_min",
+    "clamp_max",
+    "clamp_",
+    "clamp_min_",
+    "clamp_max_",
+]
+_old_tensor_factory = torch.tensor
+
 _EMPTY_DATA = torch.empty(0)
 
 
@@ -145,34 +163,48 @@ class LazyTensor(torch.Tensor):
     """
 
     _repr = True
-    _meta_data: Optional[MetaTensor] = None  # shape, dtype, device
+    _meta_data: Optional[torch.Tensor] = None  # shape, dtype, device
     _pre_op_fn: Callable[["LazyTensor"], None] = lambda *args: None
 
     default_device: Optional[torch.device] = None
+    _device: torch.device  # fake device of mate tensor
 
     @staticmethod
     def __new__(cls, func, *args, meta_data=None, concrete_data=None, **kwargs):
+        # tips for torch 2.0:
+        # torch 2.0 disables torch dispatch for subclass of tensor
+        # MetaTensor is cannot be used
+        # Now lazy tensor contains device injection and meta tensor
         if concrete_data is not None:
             # some ops don't support meta backend and should have concrete data
             elem = concrete_data
         else:
             if meta_data is None:
-                device = kwargs.get("device", "cpu")
-                elem = func(*args, **{**kwargs, "device": "meta"})
-                meta_data = MetaTensor(elem, device=device)
-            elem = meta_data._tensor
+                with ConstructorManager.disable():
+                    # to disable create lazy tensor in inner ops, this is a hack for torch 2.0
+                    meta_data = func(*args, **{**kwargs, "device": "meta"})
+            elem = meta_data
         # As a meta tensor cannot be modified __class__ to torch.Tensor, we should use an empty real tensor here
         r = torch.Tensor._make_subclass(cls, _EMPTY_DATA, require_grad=elem.requires_grad)
         r._meta_data = meta_data
+
         return r
 
     def __init__(self, func, *args, meta_data=None, concrete_data=None, **kwargs):
+        self._device = torch.device(kwargs.get("device", None) or "cpu")
         if func.__name__ in _NORMAL_FACTORY:
             kwargs = {**kwargs, "device": LazyTensor.default_device}
         self._factory_method = (func, args, kwargs)  # (func, args, kwargs)
         self._op_buffer = []  # (func, args, kwargs, replace)
         self._materialized_data: Optional[torch.Tensor] = concrete_data  # materialized data
 
+    @property
+    def device(self) -> torch.device:
+        return self._materialized_data.device if self._materialized_data is not None else self._device
+
+    def __repr__(self):
+        return f"LazyTensor(..., size={tuple(self.shape)}, device='{self.device}', dtype={self.dtype})"
+
     def materialize(self) -> torch.Tensor:
         """Materialize the ``LazyTensor`` to ``torch.Tensor`` by modifying __class__ (inplace).
 
@@ -183,20 +215,6 @@ class LazyTensor(torch.Tensor):
         self.clean()
         return _convert_cls(self, target)
 
-    def distribute(self, device_mesh: DeviceMesh, sharding_spec: ShardingSpec) -> torch.Tensor:
-        """Distribute the ``LazyTensor`` to ``torch.Tensor`` by modifying __class__ (inplace), according to the layout.
-
-        Args:
-            layout (Layout): Distribution layout.
-
-        Returns:
-            torch.Tensor: The distributed tensor (self).
-        """
-        target = self._materialize_data()
-        self.clean()
-        local_tensor = distribute_tensor(target, device_mesh, sharding_spec)
-        return _convert_cls(self, local_tensor)
-
     def clean(self) -> None:
         """Clean all stored operations, meta data and materialized data, which prevents memory leaking. This should be called after all tensors are materialized."""
         delattr(self, "_factory_method")
@@ -299,45 +317,80 @@ class LazyTensor(torch.Tensor):
                         # for early materialized tensor, use its materialized data directly
                         return x._materialized_data if is_change_meta_op else x._materialized_data.data
                     t = x if is_inplace else x.clone()
-                    t._op_buffer.append((func, args, kwargs))
+                    if func.__name__ not in _NO_RERUN_OPS:
+                        t._op_buffer.append((func, args, kwargs))
                     meta = x._meta_data if is_change_meta_op else x._meta_data.data
                     meta_to_lazy[meta] = t
                     return meta
+                elif (
+                    version.parse(torch.__version__) >= version.parse("2.0.0")
+                    and func.__name__ in _EXPAND_SCALAR_OPS
+                    and not isinstance(x, torch.Tensor)
+                ):
+                    return _old_tensor_factory(x, device="meta")
                 return x
 
             def wrap(y, i=None):
-                if isinstance(y, MetaTensor):
-                    if y in meta_to_lazy:
-                        # inplace op, just return origin lazy tensor
-                        return meta_to_lazy[y]
+                if isinstance(y, torch.Tensor):
+                    if y.is_meta:
+                        if y in meta_to_lazy:
+                            # inplace op, just return origin lazy tensor
+                            return meta_to_lazy[y]
+                        else:
+                            # out of place op, create new lazy tensor
+                            fn = lambda *a, **kw: func(*a, **kw) if i is None else func(*a, **kw)[i]
+                            fn.__name__ = func.__name__
+                            lazy_y = LazyTensor(fn, *args, meta_data=y, **kwargs)
+                            return lazy_y
                     else:
-                        # out of place op, create new lazy tensor
-                        fn = lambda *a, **kw: func(*a, **kw) if i is None else func(*a, **kw)[i]
-                        fn.__name__ = func.__name__
-                        lazy_y = LazyTensor(fn, *args, meta_data=y, **kwargs)
-                        return lazy_y
-                elif type(y) is Tensor:
-                    # for early materialized tensor
-                    return LazyTensor(lambda: None, concrete_data=y)
+                        # for early materialized tensor
+                        return LazyTensor(lambda: None, concrete_data=y)
                 return y
 
             cls._pre_op_fn()
-            o = func(*tree_map(unwrap, args), **tree_map(unwrap, kwargs))
+            with ConstructorManager.disable():
+                # to disable create lazy tensor in inner ops, this is a hack for torch 2.0
+                o = func(*tree_map(unwrap, args), **tree_map(unwrap, kwargs))
             if isinstance(o, (tuple, list)):
                 return type(o)(wrap(y, i=i) for i, y in enumerate(o))
             return wrap(o)
 
-    @classmethod
-    def __torch_dispatch__(cls, func, types, args=(), kwargs=None):
-        pass  # skip
+    def to(self, *args, **kwargs) -> torch.Tensor:
+        if self._materialized_data is not None:
+            return LazyTensor(lambda: None, concrete_data=self._materialized_data.to(*args, **kwargs))
+
+        device = None
+
+        def replace(x):
+            nonlocal device
+            if isinstance(x, (str, int, torch.device)) and not isinstance(x, bool):
+                device = x
+                return torch.device("meta")
+            return x
+
+        meta_data = self._meta_data.to(*tree_map(replace, args), **tree_map(replace, kwargs))
+
+        if meta_data is self._meta_data and device == self.device:
+            return self
+
+        def factory_fn(t: torch.Tensor, **kw):
+            return t.to(*args, **kwargs)
+
+        return LazyTensor(factory_fn, self, meta_data=meta_data, device=device)
+
+    def cpu(self, memory_format: torch.memory_format = torch.preserve_format):
+        return self.to(device=torch.device("cpu"), memory_format=memory_format)
+
+    def cuda(self, device=None, non_blocking=False, memory_format: torch.memory_format = torch.preserve_format):
+        device = torch.device(device or "cuda")
+        return self.to(device=device, non_blocking=non_blocking, memory_format=memory_format)
 
     def clone(self) -> "LazyTensor":
-        def factory_fn():
+        def factory_fn(t: torch.Tensor, **kw):
             # if self is materialized, return self
-            new_tensor = self.materialize() if type(self) is LazyTensor else self
-            return new_tensor.clone()
+            return t.clone()
 
-        target = LazyTensor(factory_fn, meta_data=self._meta_data)
+        target = LazyTensor(factory_fn, self, meta_data=self._meta_data)
 
         return target
 
@@ -353,17 +406,16 @@ class LazyTensor(torch.Tensor):
         if id(self) in memo:
             return memo[id(self)]
 
-        def factory_fn():
+        def factory_fn(t: torch.Tensor, **kw):
             # if self is materialized, return self
-            new_tensor = self.materialize() if type(self) is LazyTensor else self
-            return _copy_tensor(new_tensor, new_tensor.requires_grad)
+            return _copy_tensor(t, t.requires_grad)
 
         if self._materialized_data is not None:
             # self is early materialized
             copied = _copy_tensor(self._materialized_data, self.requires_grad)
             target = LazyTensor(lambda: None, concrete_data=copied)
         else:
-            target = LazyTensor(factory_fn, meta_data=self._meta_data)
+            target = LazyTensor(factory_fn, self, meta_data=self._meta_data)
 
         if isinstance(self, Parameter):
             # hack isinstance check of parameter
@@ -394,14 +446,12 @@ class LazyTensor(torch.Tensor):
         if other is self:
             return
 
-        self._op_buffer.append(other._factory_method)
-
         def replace(x):
             if x is other:
                 return self
             return x
 
-        for func, args, kwargs in other._op_buffer:
+        for func, args, kwargs in [other._factory_method, *other._op_buffer]:
             self._op_buffer.append((func, tree_map(replace, args), tree_map(replace, kwargs)))
 
     def tolist(self) -> list:
@@ -455,7 +505,6 @@ class LazyInitContext:
         default_device: Optional[Union[torch.device, str, int]] = None,
     ):
         assert tensor_cls is LazyTensor or tensor_cls is _MyTensor
-        self.overrides = {}
         self.tensor_cls = tensor_cls
         self.old_default_device = LazyTensor.default_device
         self.default_device = default_device
@@ -478,7 +527,9 @@ class LazyInitContext:
             # factory_like functions (eg. torch.empty_like())
             def wrapper(*args, **kwargs):
                 orig_t = args[0]
-                return self.tensor_cls(orig_target, *args[1:], device=orig_t.device, dtype=orig_t.dtype, **kwargs)
+                return self.tensor_cls(
+                    orig_target, *orig_t.shape, *args[1:], device=orig_t.device, dtype=orig_t.dtype, **kwargs
+                )
 
             return wrapper, target
 
@@ -513,13 +564,13 @@ class LazyInitContext:
 
             return wrapper, target
 
-        self.overrides = {
+        overrides = {
             target: wrap_factory_method(getattr(torch, target))
             for target in _NORMAL_FACTORY
             if callable(getattr(torch, target, None))
         }
 
-        self.overrides.update(
+        overrides.update(
             {
                 target + "_like": wrap_factory_like_method(getattr(torch, target), getattr(torch, target + "_like"))
                 for target in _NORMAL_FACTORY
@@ -527,7 +578,7 @@ class LazyInitContext:
             }
         )
 
-        self.overrides.update(
+        overrides.update(
             {
                 target: wrap_legacy_constructor(getattr(torch, target), dtype)
                 for target, dtype in _LEGACY_TENSOR_CONSTRUCTOR.items()
@@ -535,7 +586,7 @@ class LazyInitContext:
             }
         )
 
-        self.overrides.update(
+        overrides.update(
             {
                 target: wrap_no_meta_factory(getattr(torch, target))
                 for target in _NO_META_FACTORY
@@ -543,14 +594,12 @@ class LazyInitContext:
             }
         )
 
-        for name, (wrapper, orig) in self.overrides.items():
-            setattr(torch, name, wrapper)
+        ConstructorManager.apply(overrides)
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         self.tensor_cls.default_device = self.old_default_device
         LazyInitContext._replaced = False
-        for name, (wrapper, orig) in self.overrides.items():
-            setattr(torch, name, orig)
+        ConstructorManager.clear()
 
     @staticmethod
     def materialize(module: nn.Module, verbose: bool = False) -> nn.Module:
@@ -566,23 +615,6 @@ class LazyInitContext:
 
         return _apply_to_lazy_module(module, apply_fn, verbose)
 
-    @staticmethod
-    def distribute(
-        module: nn.Module, device_mesh: DeviceMesh, sharding_spec_dict: Dict[str, ShardingSpec], verbose: bool = False
-    ) -> nn.Module:
-        """Distribute all ``Parameter`` from ``LazyTensor``. This function will modify the module in-place.
-
-        Args:
-            module (nn.Module): Target ``nn.Module``
-            layout_dict (dict): Dict of layout for each parameter/buffer. The key is the parameter/buffer name, and the value is the layout.
-            verbose (bool, optional): Whether to print lazy initialization rate. Defaults to False.
-        """
-
-        def apply_fn(name: str, p: LazyTensor):
-            p.distribute(device_mesh, sharding_spec_dict[name])
-
-        return _apply_to_lazy_module(module, apply_fn, verbose)
-
 
 def _apply_to_lazy_module(
     module: nn.Module, apply_fn: Callable[[str, torch.Tensor], None], verbose: bool = False
@@ -622,20 +654,17 @@ def _apply_to_lazy_module(
 
     if verbose:
         non_lazy_numel_ratio = non_lazy_numel / total_numel * 100 if non_lazy_numel != 0 else 0
-        _print_rank_0(f"Param lazy rate: {param_lazy_cnt}/{param_cnt}")
-        _print_rank_0(f"Buffer lazy rate: {buf_lazy_cnt}/{buf_cnt}")
-        _print_rank_0(
-            f"Non lazy numel: {non_lazy_numel} ({non_lazy_numel/1024**2:.3f} M), ratio: {non_lazy_numel_ratio}%"
+        logger = get_dist_logger()
+        logger.info(f"Param lazy rate: {param_lazy_cnt}/{param_cnt}", ranks=[0])
+        logger.info(f"Buffer lazy rate: {buf_lazy_cnt}/{buf_cnt}", ranks=[0])
+        logger.info(
+            f"Non lazy numel: {non_lazy_numel} ({non_lazy_numel/1024**2:.3f} M), ratio: {non_lazy_numel_ratio}%",
+            ranks=[0],
         )
 
     return module
 
 
-def _print_rank_0(*args, **kwargs):
-    if not dist.is_initialized() or dist.get_rank() == 0:
-        print(*args, **kwargs)
-
-
 def _is_int_tuple(args) -> bool:
     if not isinstance(args, tuple):
         return False

tests/test_lazy/test_models.py

@@ -11,14 +11,12 @@ def test_torchvision_models_lazy_init(subset, default_device):
     sub_model_zoo = model_zoo.get_sub_registry(subset)
     for name, entry in sub_model_zoo.items():
         # TODO(ver217): lazy init does not support weight norm, skip these models
-        if (
-            name in ("torchaudio_wav2vec2_base", "torchaudio_hubert_base")
-            or name.startswith("transformers_llama")
-            or name.startswith(("transformers_vit", "transformers_blip2"))
+        if name in ("torchaudio_wav2vec2_base", "torchaudio_hubert_base") or name.startswith(
+            ("transformers_vit", "transformers_blip2")
         ):
             continue
         check_lazy_init(entry, verbose=True, default_device=default_device)
 
 
 if __name__ == "__main__":
-    test_torchvision_models_lazy_init("torchvision")
+    test_torchvision_models_lazy_init("transformers", "cpu")

tests/test_lazy/test_ops.py

@@ -0,0 +1,64 @@
+import copy
+
+import pytest
+import torch
+import torch.nn as nn
+from lazy_init_utils import SUPPORT_LAZY
+from torch.nn import Parameter
+
+from colossalai.lazy import LazyInitContext
+
+
+@pytest.mark.skipif(not SUPPORT_LAZY, reason="requires torch >= 1.12.0")
+def test_lazy_ops():
+    with LazyInitContext():
+        x = torch.rand(2, 3)
+        assert tuple(x.shape) == (2, 3)
+        assert x.device.type == "cpu"
+        x.requires_grad is False
+        y = x.cuda()
+        assert tuple(y.shape) == (2, 3)
+        assert y.device.type == "cuda"
+        assert y.requires_grad is False
+        assert x.cpu() is x
+        p = Parameter(torch.empty(2, 3))
+        assert tuple(p.shape) == (2, 3)
+        assert p.device.type == "cpu"
+        assert p.requires_grad is True
+        assert isinstance(p, Parameter)
+    x.materialize()
+    assert tuple(x.shape) == (2, 3)
+    assert x.device.type == "cpu"
+    assert x.requires_grad is False
+    y.materialize()
+    assert tuple(y.shape) == (2, 3)
+    assert y.device.type == "cuda"
+    assert y.requires_grad is False
+    p.materialize()
+    assert tuple(p.shape) == (2, 3)
+    assert p.device.type == "cpu"
+    assert p.requires_grad is True
+    assert isinstance(p, Parameter)
+
+    with LazyInitContext():
+        x = torch.empty(2, 3)
+        x.uniform_()
+    x.materialize()
+    assert tuple(x.shape) == (2, 3)
+
+    with LazyInitContext():
+        model = nn.Linear(3, 4)
+        model = model.cuda()
+        model_copied = copy.deepcopy(model)
+    LazyInitContext.materialize(model)
+    assert model.weight.device.type == "cuda"
+    assert model.bias.device.type == "cuda"
+    LazyInitContext.materialize(model_copied)
+    assert model_copied.weight.device.type == "cuda"
+    assert model_copied.bias.device.type == "cuda"
+    assert torch.equal(model.weight, model_copied.weight)
+    assert torch.equal(model.bias, model_copied.bias)
+
+
+if __name__ == "__main__":
+    test_lazy_ops()