Remove inconsistent FB copyright headers (#3741)

test/cpp/test_custom_operators.cpp

-// Copyright 2004-present Facebook. All Rights Reserved.
-
 #include <gtest/gtest.h>
 #include <torch/script.h>
 #include <torch/torch.h>

torchvision/csrc/io/decoder/stream.cpp

@@ -17,7 +17,7 @@ Stream::Stream(
 
 Stream::~Stream() {
   if (frame_) {
-    av_free(frame_); // Copyright 2004-present Facebook. All Rights Reserved.
+    av_free(frame_);
   }
   if (codecCtx_) {
     avcodec_free_context(&codecCtx_);

torchvision/models/detection/anchor_utils.py

-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 import torch
 from torch import nn, Tensor
 

torchvision/models/detection/generalized_rcnn.py

-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 """
 Implements the Generalized R-CNN framework
 """

torchvision/models/detection/image_list.py

-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 import torch
 from torch import Tensor
 from typing import List, Tuple

torchvision/models/detection/rpn.py

-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 import torch
 from torch.nn import functional as F
 from torch import nn, Tensor

torchvision/ops/poolers.py

-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 import torch
 from torch import nn, Tensor