perf(mge/optimizer): close conver_inputs for optimizer step

GitOrigin-RevId: c710530d934e1be29e611322b75837c9b72a610c

imperative/python/megengine/core/tensor/utils.py

@@ -16,6 +16,25 @@ from ..ops.special import Const
 from ..tensor.core import OpBase, TensorBase, TensorWrapperBase, apply
 from .dtype import is_equal, is_quantize
 
+_enable_convert_inputs = True
+
+
+def get_convert_inputs():
+    """ get the curerent state of `_enable_convert_inputs` """
+    return _enable_convert_inputs
+
+
+def set_convert_inputs(flag):
+    """ This function is a temporary workaround for reducing the overhead of operator
+    invocations. The function `convert_inputs` is disabled if the global state
+    `_enable_convert_inputs` is set to `False`, otherwise enabled. This function is for
+    internal use only, and should be removed when the tensor-like system is refactored.
+    """
+    global _enable_convert_inputs
+    backup = _enable_convert_inputs
+    _enable_convert_inputs = flag
+    return backup
+
 
 def dtype_promotion(inputs):
     """
@@ -129,6 +148,9 @@ def convert_single_value(v, inputs, *, dtype=None, device=None):
 
 
 def convert_inputs(*args: TensorBase):
+    if not _enable_convert_inputs:
+        return args
+
     dtype = dtype_promotion(args)
     device = get_device(args)
 

imperative/python/megengine/optimizer/adadelta.py

@@ -10,8 +10,8 @@ from typing import Iterable, Union
 
 import numpy as np
 
-from ..functional import sqrt
-from ..tensor import Parameter
+from ..core.tensor.tensor import Tensor
+from ..tensor import Parameter, tensor
 from .optimizer import Optimizer
 
 
@@ -62,6 +62,16 @@ class Adadelta(Optimizer):
         rho = param_group["rho"]
         eps = param_group["eps"]
 
+        # since `conver_inputs` is disabled for param updates,
+        # scalar should be explicitly tansforred to tensor
+        _lr = tensor([lr])
+        _weight_decay = tensor([weight_decay])
+        _rho = tensor([rho])
+        _eps = tensor([eps])
+
+        c05 = tensor([0.5])
+        c1 = tensor([1.0])
+        c2 = tensor([2.0])
         for param in param_group["params"]:
 
             if param.grad is None:
@@ -69,17 +79,17 @@ class Adadelta(Optimizer):
 
             states = self._state[param]
             step = states["step"]
-            step += 1.0
+            step += c1
             grad = param.grad
             if weight_decay != 0.0:
-                grad += param * weight_decay
+                grad += param * _weight_decay
 
             square_avg = states["square_avg"]
             acc_delta = states["acc_delta"]
-            square_avg = rho * square_avg + (1 - rho) * grad ** 2
-            std = sqrt(square_avg + eps)
-            delta = sqrt(acc_delta + eps) / std * grad
-            param -= lr * delta
-            acc_delta = rho * acc_delta + (1 - rho) * delta ** 2
+            square_avg = _rho * square_avg + (c1 - _rho) * grad ** c2
+            std = (square_avg + _eps) ** c05
+            delta = (acc_delta + _eps) ** c05 / std * grad
+            param -= _lr * delta
+            acc_delta = _rho * acc_delta + (c1 - _rho) * delta ** c2
             states["square_avg"]._reset(square_avg)
             states["acc_delta"]._reset(acc_delta)

imperative/python/megengine/optimizer/adagrad.py

@@ -10,8 +10,8 @@ from typing import Iterable, Union
 
 import numpy as np
 
-from ..functional import sqrt
-from ..tensor import Parameter
+from ..core.tensor.tensor import Tensor
+from ..tensor import Parameter, tensor
 from .optimizer import Optimizer
 
 
@@ -61,6 +61,16 @@ class Adagrad(Optimizer):
         weight_decay = param_group["weight_decay"]
         eps = param_group["eps"]
 
+        # since `conver_inputs` is disabled for param updates,
+        # scalar should be explicitly tansforred to tensor
+        _lr = tensor([lr])
+        _lr_decay = tensor([lr_decay])
+        _weight_decay = tensor([weight_decay])
+        _eps = tensor([eps])
+
+        c05 = tensor([0.5])
+        c1 = tensor([1.0])
+        c2 = tensor([2.0])
         for param in param_group["params"]:
 
             if param.grad is None:
@@ -68,14 +78,14 @@ class Adagrad(Optimizer):
 
             states = self._state[param]
             step = states["step"]
-            step += 1.0
+            step += c1
             grad = param.grad
             if weight_decay != 0.0:
-                grad += param * weight_decay
+                grad += param * _weight_decay
 
             square_avg = states["square_avg"]
-            square_avg += grad ** 2
-            delta = grad / sqrt(square_avg + eps)
-            clr = lr / (1 + (step - 1) * lr_decay)
+            square_avg += grad ** c2
+            delta = grad / (square_avg + _eps) ** c05
+            clr = _lr / (c1 + (step - c1) * _lr_decay)
 
             param -= clr * delta

imperative/python/megengine/optimizer/adam.py

@@ -8,7 +8,8 @@
 # "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 from typing import Iterable, Tuple, Union
 
-from ..tensor import Parameter
+from ..core.tensor.tensor import Tensor
+from ..tensor import Parameter, tensor
 from .optimizer import Optimizer
 
 
@@ -58,6 +59,15 @@ class Adam(Optimizer):
         eps = param_group["eps"]
         beta0, beta1 = param_group["betas"]
 
+        # since `conver_inputs` is disabled for param updates,
+        # scalar should be explicitly tansforred to tensor
+        _lr = tensor([lr])
+        _weight_decay = tensor([weight_decay])
+        _eps = tensor([eps])
+        _beta0, _beta1 = tensor([beta0]), tensor([beta1])
+
+        c1 = tensor([1.0])
+        c05 = tensor([0.5])
         for param in param_group["params"]:
 
             if param.grad is None:
@@ -65,20 +75,20 @@ class Adam(Optimizer):
 
             grad = param.grad
             if weight_decay != 0.0:
-                grad += param * weight_decay
+                grad += param * _weight_decay
 
             states = self._state[param]
             step = states["step"]
-            step += 1.0
+            step += c1
             exp_avg = states["exp_avg"]
             exp_avg_sq = states["exp_avg_sq"]
-            exp_avg = beta0 * exp_avg + grad * (1 - beta0)
-            exp_avg_sq = beta1 * exp_avg_sq + (1 - beta1) * (grad * grad)
+            exp_avg = _beta0 * exp_avg + grad * (c1 - _beta0)
+            exp_avg_sq = _beta1 * exp_avg_sq + (c1 - _beta1) * (grad * grad)
 
-            delta = (exp_avg / (1 - beta0 ** step)) / (
-                (exp_avg_sq / (1 - beta1 ** step)) ** 0.5 + eps
+            delta = (exp_avg / (c1 - _beta0 ** step)) / (
+                (exp_avg_sq / (c1 - _beta1 ** step)) ** c05 + _eps
             )
-            param -= lr * delta
+            param -= _lr * delta
 
             # not inplace change, need to update underlying tensor handler in state
             states["exp_avg"]._reset(exp_avg)

imperative/python/megengine/optimizer/optimizer.py

@@ -15,6 +15,7 @@ from typing import Union
 
 import numpy as np
 
+from ..core.tensor.utils import set_convert_inputs
 from ..tensor import Parameter, Tensor
 from ..utils.deprecation import deprecated
 
@@ -143,6 +144,9 @@ class Optimizer(metaclass=ABCMeta):
         Performs a single optimization step.
 
         """
+        # set the globle state `_enable_convert_inputs` to `False` to disable
+        # the `convert_inputs` for param updates
+        backup = set_convert_inputs(False)
         for group in self.param_groups:
             if isinstance(group["params"], set):
                 raise TypeError(
@@ -151,6 +155,8 @@ class Optimizer(metaclass=ABCMeta):
                     "Please use a list instead."
                 )
             self._updates(group)
+        # restore the globle state `_enable_convert_inputs`
+        set_convert_inputs(backup)
         return self
 
     @deprecated(version="1.0", reason="use clear_grad instead")

imperative/python/megengine/optimizer/sgd.py

@@ -8,7 +8,8 @@
 # "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 from typing import Iterable, Union
 
-from ..tensor import Parameter
+from ..core.tensor.tensor import Tensor
+from ..tensor import Parameter, tensor
 from .optimizer import Optimizer
 
 
@@ -52,18 +53,24 @@ class SGD(Optimizer):
         weight_decay = param_group["weight_decay"]
         momentum = param_group["momentum"]
 
+        # since `conver_inputs` is disabled for param updates,
+        # scalar should be explicitly tansforred to tensor
+        _lr = tensor([lr])
+        _weight_decay = tensor([weight_decay])
+        _momentum = tensor([momentum])
+
         for param in param_group["params"]:
             if param.grad is None:
                 continue
 
             grad = param.grad
             if weight_decay != 0.0:
-                grad += param * weight_decay
+                grad += param * _weight_decay
 
             if momentum:
                 v = self._state[param]["momentum_buffer"]
-                v = momentum * v + grad
-                param -= lr * v
+                v = _momentum * v + grad
+                param -= _lr * v
                 self._state[param]["momentum_buffer"]._reset(v)
             else:
-                param -= lr * grad
+                param -= _lr * grad