[XPU] support op builder from intel_extension_for_pytorch kernel path (…

…microsoft#5425)

#Motivation
From our next release, xpu DeepSpeed related kernels would be put into
intel_extension_for_pytorch. This PR is to add new op builders and use
kernel path from intel_extension_for_pytorch. More ops like MOE and WOQ
will be added.

---------

Co-authored-by: Logan Adams <[email protected]>
Co-authored-by: Olatunji Ruwase <[email protected]>

accelerator/xpu_accelerator.py

@@ -9,6 +9,9 @@
 import oneccl_bindings_for_pytorch  # noqa: F401 # type: ignore
 import functools
 
+import importlib
+import inspect
+
 
 class XPU_Accelerator(DeepSpeedAccelerator):
 
@@ -17,6 +20,7 @@ def __init__(self):
         self._communication_backend_name = 'ccl'
         self._compile_backend = "inductor"
         self.aligned_tensors = []
+        self.class_dict = None
 
     def is_synchronized_device(self):
         return False
@@ -257,35 +261,29 @@ def on_accelerator(self, tensor):
         else:
             return False
 
+    def _lazy_init_class_dict(self):
+        if self.class_dict:
+            return
+
+        op_builder_module = importlib.import_module(self.op_builder_dir())
+
+        # get op builder class from op_builder/xpu/__init__.py
+        self.class_dict = {}
+        for class_name, class_obj in inspect.getmembers(op_builder_module, inspect.isclass):
+            self.class_dict[class_name] = class_obj
+
     # create an instance of op builder and return, name specified by class_name
-    def create_op_builder(self, op_name):
-        builder_class = self.get_op_builder(op_name)
-        if builder_class != None:
-            return builder_class()
-        return None
+    def create_op_builder(self, class_name):
+        builder_class = self.get_op_builder(class_name)
+        return builder_class()
 
     # return an op builder class, name specified by class_name
     def get_op_builder(self, class_name):
-        try:
-            # is op_builder from deepspeed or a 3p version? this should only succeed if it's deepspeed
-            # if successful this also means we're doing a local install and not JIT compile path
-            from op_builder import __deepspeed__  # noqa: F401 # type: ignore
-            from op_builder.xpu import CPUAdagradBuilder, CPUAdamBuilder, FusedAdamBuilder, AsyncIOBuilder, PackbitsBuilder
-        except ImportError:
-            from deepspeed.ops.op_builder.xpu import CPUAdagradBuilder, CPUAdamBuilder, FusedAdamBuilder, AsyncIOBuilder, PackbitsBuilder
-
-        if class_name == "AsyncIOBuilder":
-            return AsyncIOBuilder
-        elif class_name == "CPUAdagradBuilder":
-            return CPUAdagradBuilder
-        elif class_name == "CPUAdamBuilder":
-            return CPUAdamBuilder
-        elif class_name == "FusedAdamBuilder":
-            return FusedAdamBuilder
-        elif class_name == "PackbitsBuilder":
-            return PackbitsBuilder
+        self._lazy_init_class_dict()
+        if class_name in self.class_dict:
+            return self.class_dict[class_name]
         else:
-            return None
+            return self.class_dict['NotImplementedBuilder']
 
     def build_extension(self):
         try:

deepspeed/comm/ccl.py

@@ -8,13 +8,14 @@
 
 import torch
 from deepspeed.accelerator import get_accelerator
+from deepspeed.ops.op_builder import NotImplementedBuilder
 from .reduce_op import ReduceOp
 from .torch import TorchBackend
 
 
 def build_ccl_op():
     builder = get_accelerator().create_op_builder("CCLCommBuilder")
-    if builder is None:
+    if builder is None or NotImplementedBuilder:
         return None
     ccl_cpp_module = builder.load()
     print(f'DeepSpeed {builder.absolute_name()} built successfully')

op_builder/xpu/__init__.py

@@ -7,4 +7,7 @@
 from .cpu_adagrad import CPUAdagradBuilder
 from .fused_adam import FusedAdamBuilder
 from .async_io import AsyncIOBuilder
+from .inference import InferenceBuilder
+from .flash_attn import FlashAttentionBuilder
+from .no_impl import NotImplementedBuilder
 from .packbits import PackbitsBuilder

op_builder/xpu/flash_attn.py

@@ -0,0 +1,53 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+# DeepSpeed Team
+from .builder import SYCLOpBuilder
+
+
+class FlashAttentionBuilderObject():
+
+    def __init__(self):
+        pass
+
+    # general functions
+    def flash_attn_func_v2(self, q, k, v, dropout_p, softmax_scale, is_causal):
+        try:
+            import torch
+            import intel_extension_for_pytorch  # noqa
+            return torch.nn.functional.scaled_dot_product_attention(q,
+                                                                    k,
+                                                                    v,
+                                                                    dropout_p=dropout_p,
+                                                                    is_causal=is_causal,
+                                                                    scale=softmax_scale)
+        except ImportError:
+            raise ImportError(
+                "Please install pytorch and intel_extension_for_pytorch to include scaled dot product attention.")
+
+
+class FlashAttentionBuilder(SYCLOpBuilder):
+    BUILD_VAR = "DS_BUILD_FlashAttention"
+    NAME = "flash_attn"
+
+    def __init__(self, name=None):
+        name = self.NAME if name is None else name
+        super().__init__(name=name)
+
+    def absolute_name(self):
+        return f'deepspeed.ops.{self.NAME}_op'
+
+    def sources(self):
+        return
+
+    def include_paths(self):
+        return []
+
+    def extra_ldflags(self):
+        return []
+
+    def cxx_args(self):
+        return []
+
+    def load(self):
+        return FlashAttentionBuilderObject()

op_builder/xpu/inference.py

@@ -0,0 +1,36 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+# DeepSpeed Team
+from .builder import SYCLOpBuilder
+
+
+class InferenceBuilder(SYCLOpBuilder):
+    BUILD_VAR = "DS_BUILD_TRANSFORMER_INFERENCE"
+    NAME = "transformer_inference"
+
+    def __init__(self, name=None):
+        name = self.NAME if name is None else name
+        super().__init__(name=name)
+
+    def absolute_name(self):
+        return f'deepspeed.ops.transformer.inference.{self.NAME}_op'
+
+    def sources(self):
+        return
+
+    def include_paths(self):
+        return []
+
+    def extra_ldflags(self):
+        return []
+
+    def cxx_args(self):
+        return []
+
+    def load(self):
+        try:
+            import intel_extension_for_pytorch.deepspeed
+            return intel_extension_for_pytorch.deepspeed.transformer_inference.transformer_inference
+        except ImportError:
+            raise ImportError("Please install intel-extension-for-pytorch >= 2.1.30 to include DeepSpeed kernels.")

op_builder/xpu/no_impl.py

@@ -0,0 +1,33 @@
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+# DeepSpeed Team
+
+from .builder import SYCLOpBuilder
+
+
+class NotImplementedBuilder(SYCLOpBuilder):
+    BUILD_VAR = "DS_BUILD_NOT_IMPLEMENTED"
+    NAME = "deepspeed_not_implemented"
+
+    def __init__(self, name=None):
+        name = self.NAME if name is None else name
+        super().__init__(name=name)
+
+    def absolute_name(self):
+        return f'deepspeed.ops.{self.NAME}_op'
+
+    def load(self, verbose=True):
+        raise ValueError("This op had not been implemented on XPU backend.")
+
+    def sources(self):
+        return []
+
+    def cxx_args(self):
+        return []
+
+    def extra_ldflags(self):
+        return []
+
+    def include_paths(self):
+        return []