Dual license the torch-mlir project.

This commit (with approval from all contributors) dual licenses
the torch-mlir project under both the standard LLVM license and the
standard PyTorch license. This will facilitate moving code between
torch-mlir and the two upstream projects.

The standard file comment is now:

```
// This file is licensed under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Also available under a BSD-style license. See LICENSE.
```

See `LICENSE` in the project root for the terms of both licenses.

LICENSE

@@ -1,7 +1,16 @@
 ==============================================================================
-The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
-As an incubator project with ambition to become part of the LLVM Project,
-CIRCT is under the same license.
+Dual License
+==============================================================================
+
+The torch-mlir project is dual licensed under both the standard LLVM Project
+license of Apache License v2.0 with LLVM Exceptions and a BSD-style license from
+PyTorch. As a user of this code you may choose to use it under either license.
+As a contributor, you agree to allow your code to be used under both.
+
+Full text of the relevant licenses is included below.
+
+==============================================================================
+Standard LLVM Project License
 ==============================================================================
                                  Apache License
                            Version 2.0, January 2004
@@ -233,3 +242,37 @@ mechanisms:
    which apply to that software, or
 2) It will contain specific license and restriction terms at the top of every
    file.
+
+==============================================================================
+BSD-style License
+==============================================================================
+
+Copyright (c) 2020 LLVM Foundation.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the names of Facebook, Deepmind Technologies, NYU, NEC Laboratories America
+   and IDIAP Research Institute nor the names of its contributors may be
+   used to endorse or promote products derived from this software without
+   specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.

build_tools/build_standalone.sh

@@ -1,8 +1,9 @@
 #!/bin/bash
 
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 # Simple script that does a CMake configure of this project as an external
 # LLVM project so it can be tested in isolation to larger assemblies.

build_tools/torchscript_e2e_heavydep_tests/basic_mt.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 # Basic machine translation (MT) program.
 #

build_tools/torchscript_e2e_heavydep_tests/main.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import argparse
 import os

e2e_testing/torchscript/basic.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 

e2e_testing/torchscript/batchnorm.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 

e2e_testing/torchscript/conv.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 from torch_mlir_e2e_test.torchscript.framework import TestUtils

e2e_testing/torchscript/elementwise.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 

e2e_testing/torchscript/main.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import argparse
 import os

e2e_testing/torchscript/mlp.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 import torch.nn as nn

e2e_testing/torchscript/quantized_models.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 from torch import nn

e2e_testing/torchscript/reduction.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 

e2e_testing/torchscript/vision_models.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 import torch
 import torchvision.models as models

e2e_testing/torchscript/xfail_sets.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 # This file describes the sets of tests expected to fail for each config.
 # This information is deliberately kept in a side table, rather than

examples/lazytensor/builder.py

@@ -1,6 +1,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 """
 Translator from torch.jit.ScriptFunction to MLIR.
 

examples/lazytensor_tanh.py

@@ -1,6 +1,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 """
 Example of taking a Lazy Tensor computation and compiling it using torch-mlir.
 

examples/resnet_inference.ipynb

@@ -9,7 +9,8 @@
    "source": [
     "#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.\n",
     "#  See https://llvm.org/LICENSE.txt for license information.\n",
-    "#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception"
+    "#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#  Also available under a BSD-style license. See LICENSE."
    ]
   },
   {

examples/torchfx/builder.py

@@ -1,6 +1,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 """
 Translator from Torch.FX to MLIR.
 

examples/torchfx/loc.py

@@ -2,6 +2,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 #
 # pylint: disable=no-member, no-name-in-module, invalid-name, missing-function-docstring, fixme
 

examples/torchfx_add_tanh_sigmoid.py

@@ -2,6 +2,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 """
 Example of taking a moduled traced by TorchFX and compiling it using torch-mlir.
 

examples/torchscript_resnet18_e2e.py

@@ -1,6 +1,7 @@
-#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-#  See https://llvm.org/LICENSE.txt for license information.
-#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 
 from PIL import Image
 import requests

examples/utils/annotator.py

@@ -2,6 +2,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 #
 # pylint: disable=no-member, no-name-in-module, invalid-name, missing-function-docstring, fixme
 

examples/utils/torch_mlir_types.py

@@ -1,6 +1,7 @@
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
 #
 # pylint: disable=no-member, no-name-in-module, invalid-name, missing-function-docstring, fixme
 """

include/torch-mlir-c/TorchTypes.h

@@ -4,6 +4,7 @@
 // Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// Also available under a BSD-style license. See LICENSE.
 //
 //===----------------------------------------------------------------------===//
 

include/torch-mlir/Conversion/Passes.h

@@ -3,6 +3,7 @@
 // This file is licensed under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// Also available under a BSD-style license. See LICENSE.
 //
 //===----------------------------------------------------------------------===//
 

include/torch-mlir/Conversion/Passes.td

@@ -3,6 +3,7 @@
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// Also available under a BSD-style license. See LICENSE.
 //
 //===----------------------------------------------------------------------===//
 

include/torch-mlir/Conversion/TorchToLinalg/TorchToLinalg.h

@@ -3,6 +3,7 @@
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// Also available under a BSD-style license. See LICENSE.
 //
 //===----------------------------------------------------------------------===//
 

include/torch-mlir/Conversion/TorchToSCF/TorchToSCF.h

@@ -3,6 +3,7 @@
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// Also available under a BSD-style license. See LICENSE.
 //
 //===----------------------------------------------------------------------===//
 

include/torch-mlir/Conversion/TorchToStd/TorchToStd.h

@@ -3,6 +3,7 @@
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// Also available under a BSD-style license. See LICENSE.
 //
 //===----------------------------------------------------------------------===//