Fused adam for HPU (#5500)

Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>

op_builder/hpu/fused_adam.py

@@ -4,10 +4,88 @@
 
 # DeepSpeed Team
 
-from .builder import CPUOpBuilder
+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.builder import OpBuilder
+except ImportError:
+    from deepspeed.ops.op_builder.builder import OpBuilder
+
+try:
+    import torch
+    import math
+except ImportError as e:
+    pass
 
 
-class FusedAdamBuilder(CPUOpBuilder):
+class HPUFusedAdam:
+    htcore = None
+    is_lazy_mode = None
+
+    @staticmethod
+    def multi_tensor_adam(chunk_size, noop_flag_buffer, tensor_lists, lr, beta1, beta2, epsilon, step, adam_w_mode,
+                          bias_correction, weight_decay, *args):
+
+        if HPUFusedAdam.htcore is None:
+            from habana_frameworks.torch import core as htcore
+            from habana_frameworks.torch.utils.internal import is_lazy
+            HPUFusedAdam.htcore = htcore
+            HPUFusedAdam.is_lazy_mode = is_lazy()
+
+        htcore = HPUFusedAdam.htcore
+
+        htcore.step_closure._mark_step_if_lazy()
+        step_size = lr
+        if bias_correction:
+            bias_correction1 = 1.0 - pow(beta1, step)
+            bias_correction2 = 1.0 - pow(beta2, step)
+            step_size = step_size * math.sqrt(bias_correction2) / bias_correction1
+
+        neg_step = -step_size
+        neg_step_t = (torch.tensor([neg_step], dtype=torch.float,
+                                   requires_grad=False).to(tensor_lists[1][0].dtype).to(tensor_lists[1][0].device,
+                                                                                        non_blocking=True))
+
+        weight_decay = weight_decay if adam_w_mode else 0
+
+        # since lr is fed into the kernel as tensor, perform the scalar multiplication of wd here
+        # NOTE: TODO if lr is updated every step, then we need to convert it as tensor and
+        # perform weight decay unconditonally.
+        modified_wd = 1.0 - weight_decay * lr
+
+        if HPUFusedAdam.is_lazy_mode:
+            torch.ops.hpu.optimizer_adamw(
+                tensor_lists[0],
+                tensor_lists[1],
+                tensor_lists[2],
+                tensor_lists[3],
+                neg_step_t,
+                beta1,
+                beta2,
+                epsilon,
+                modified_wd,
+            )
+        else:
+            modified_wd_t = (torch.tensor([modified_wd], dtype=torch.float, requires_grad=False).to(
+                tensor_lists[1][0].dtype).to(tensor_lists[1][0].device, non_blocking=True))
+            torch.ops.hpu.optimizer_adamw(
+                tensor_lists[0],
+                tensor_lists[1],
+                tensor_lists[2],
+                tensor_lists[3],
+                neg_step_t,
+                beta1,
+                beta2,
+                epsilon,
+                modified_wd_t,
+                modified_wd != 1.0,
+            )
+
+        htcore.step_closure._mark_step_if_lazy()
+
+
+class FusedAdamBuilder(OpBuilder):
     BUILD_VAR = "DS_BUILD_FUSED_ADAM"
     NAME = "fused_adam"
 
@@ -18,12 +96,10 @@ class FusedAdamBuilder(CPUOpBuilder):
         return f'deepspeed.ops.adam.{self.NAME}_op'
 
     def sources(self):
-        return ['csrc/cpu/adam/fused_adam.cpp', 'csrc/adam/cpu_adam_impl.cpp']
-
-    def cxx_args(self):
-        args = super().cxx_args()
-        args += ['-DENABLE_BFLOAT16']
-        return args
+        return []
 
     def include_paths(self):
-        return ['csrc/includes']
+        return []
+
+    def load(self, verbose=True):
+        return HPUFusedAdam