Add licence notice to kernel files

openfold/utils/kernel/attention_core.py

+# Copyright 2021 AlQuraishi Laboratory
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 import importlib
 from functools import reduce
 from operator import mul

openfold/utils/kernel/csrc/softmax_cuda.cpp

-#include <torch/extension.h>
+// Copyright 2021 AlQuraishi Laboratory
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 // modified from fastfold/model/fastnn/kernel/cuda_native/csrc/softmax_cuda.cpp
 
+#include <torch/extension.h>
+
 void attn_softmax_inplace_forward_(
     at::Tensor input, 
     long long rows, int cols

openfold/utils/kernel/csrc/softmax_cuda_kernel.cu

+// Copyright 2021 AlQuraishi Laboratory
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// modified from fastfold/model/fastnn/kernel/cuda_native/csrc/softmax_cuda_kernel.cu
+
 #include <math_constants.h>
 #include <torch/extension.h>
 #include <c10/cuda/CUDAGuard.h>
@@ -8,8 +24,6 @@
 #include "ATen/cuda/CUDAContext.h"
 #include "compat.h"
 
-// modified from fastfold/model/fastnn/kernel/cuda_native/csrc/softmax_cuda_kernel.cu
-
 #define CHECK_CUDA(x) TORCH_CHECK(x.is_cuda(), #x " must be a CUDA tensor")
 #define CHECK_CONTIGUOUS(x) TORCH_CHECK(x.is_contiguous(), #x " must be contiguous")
 #define CHECK_INPUT(x) \