fix(subgraph): fix device recognition and scalar propagate

GitOrigin-RevId: fd2fe8bec9d9730e8689dbad314e54a7ecbc8bde

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

@@ -230,7 +230,7 @@ for name, mode in [
 def subgraph(
     name, dtype, device, nr_inputs, gopt_level=None, jit_fusion=False, custom_grad=False
 ):
-    if device.physical_name.startswith("cpu"):
+    if not device.physical_name.startswith("gpu"):
         gopt_level = None  # disable jit and compile
         jit_fusion = False
 
@@ -370,7 +370,15 @@ def subgraph_fn(
                 jit_fusion=jit_fusion,
                 custom_grad=custom_grad,
             )(func)
-            return lambda *args: apply(op(), *args)
+
+            def wrapped_func(*args):
+                if custom_grad:
+                    outputs = op()(*args)
+                else:
+                    outputs = apply(op(), *args)
+                return outputs
+
+            return wrapped_func
         else:
             return interpret_subgraph(func, dtype, device)
 

imperative/python/megengine/functional/nn.py

@@ -988,7 +988,6 @@ def _get_softplus_op(dtype=None, device=None):
         device=device,
         nr_inputs=1,
         jit_fusion=True,
-        # gopt_level=0,
         custom_grad=True,
     )
     def softplus(inputs, f, c):

imperative/python/megengine/functional/tensor.py

@@ -18,14 +18,7 @@ from ..core.ops import builtin
 from ..core.ops.builtin import Copy, Identity
 from ..core.ops.special import Const
 from ..core.tensor.array_method import _broadcast, _remove_axis
-from ..core.tensor.utils import (
-    astensor1d,
-    convert_inputs,
-    get_device,
-    isscalar,
-    setscalar,
-    subgraph_fn,
-)
+from ..core.tensor.utils import astensor1d, convert_inputs, get_device, subgraph_fn
 from ..device import get_default_device
 from ..tensor import Tensor
 from .elemwise import ceil
@@ -821,8 +814,6 @@ def where(mask: Tensor, x: Tensor, y: Tensor) -> Tensor:
 
     where = _get_where_op(dtype=dtype, device=device)
     (oup,) = where(mask, x, y)
-    if isscalar(mask):
-        setscalar(oup)
     return oup
 
 

imperative/python/src/common.cpp

@@ -67,7 +67,7 @@ void init_common(py::module m) {
                             [](const CompNode& cn) { return cn.to_string_logical(); })
                     .def_property_readonly(
                             "physical_name",
-                            [](const CompNode& cn) { return cn.to_string(); })
+                            [](const CompNode& cn) { return cn.to_string_physical(); })
                     .def_property_readonly(
                             "get_mem_status_bytes",
                             [](const CompNode& cn) {