Remove references to non-existing weights in MNASNET (#5936)

* Remove references to non-existing weights

* Update torchvision/models/mnasnet.py
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

* Update torchvision/models/mnasnet.py
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

* apply ufmt
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

docs/source/models/mnasnet.rst

@@ -11,8 +11,9 @@ Search for Mobile <https://arxiv.org/pdf/1807.11626.pdf>`__ paper.
 Model builders
 --------------
 
-The following model builders can be used to instanciate an MNASNet model, with or
-without pre-trained weights. All the model builders internally rely on the
+The following model builders can be used to instanciate an MNASNet model. Currently
+only ``mnasnet0_5`` and ``mnasnet1_0`` can be instantiated with pre-trained weights. 
+All the model builders internally rely on the
 ``torchvision.models.mnasnet.MNASNet`` base class. Please refer to the `source
 code
 <https://github.com/pytorch/vision/blob/main/torchvision/models/mnasnet.py>`_ for

torchvision/models/mnasnet.py

@@ -306,10 +306,8 @@ def mnasnet0_75(*, weights: Optional[MNASNet0_75_Weights] = None, progress: bool
     <https://arxiv.org/pdf/1807.11626.pdf>`_ paper.
 
     Args:
-        weights (:class:`~torchvision.models.MNASNet0_75_Weights`, optional): The
-            pretrained weights to use. See
-            :class:`~torchvision.models.MNASNet0_75_Weights` below for
-            more details, and possible values. By default, no pre-trained
+        weights (:class:`~torchvision.models.MNASNet0_75_Weights`, optional): Currently
+            no pre-trained weights are available and by default no pre-trained
             weights are used.
         progress (bool, optional): If True, displays a progress bar of the
             download to stderr. Default is True.
@@ -358,10 +356,8 @@ def mnasnet1_3(*, weights: Optional[MNASNet1_3_Weights] = None, progress: bool =
     <https://arxiv.org/pdf/1807.11626.pdf>`_ paper.
 
     Args:
-        weights (:class:`~torchvision.models.MNASNet1_3_Weights`, optional): The
-            pretrained weights to use. See
-            :class:`~torchvision.models.MNASNet1_3_Weights` below for
-            more details, and possible values. By default, no pre-trained
+        weights (:class:`~torchvision.models.MNASNet1_3_Weights`, optional): Currently
+            no pre-trained weights are available and by default no pre-trained
             weights are used.
         progress (bool, optional): If True, displays a progress bar of the
             download to stderr. Default is True.