Fix unused variable warnings (#72410)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/72410
Fixes
```
caffe2/caffe2/operators/cross_entropy_op.cu(330): warning: parameter "outer_size" was declared but never referenced
caffe2/caffe2/operators/cross_entropy_op.cu(191): warning: parameter "outer_size" was declared but never referenced
caffe2/caffe2/operators/generate_proposals_op_util_nms.h(347): warning: variable "order" was declared but never referenced
caffe2/caffe2/operators/segment_reduction_op_gpu.cu(319): warning: parameter "N" was declared but never referenced
detected during:
instantiation of "__nv_bool caffe2::CUDASparseLengthsWeightedSumOp<T, Context, SparseFused>::DoRunWithType<IndexType>() [with T=float, Context=caffe2::CUDAContext, SparseFused=true, IndexType=int32_t]"
caffe2/caffe2/core/operator.h(1304): here
instantiation of "__nv_bool caffe2::DispatchHelper<caffe2::TensorTypes<FirstType, Types...>, ExtraArgs...>::call(Op *, caffe2::TypeMeta) [with FirstType=int32_t, Types=<int64_t>, ExtraArgs=<>, Op=caffe2::CUDASparseLengthsWeightedSumOp<float, caffe2::CUDAContext, true>]"
caffe2/caffe2/core/operator.h(1304): here
instantiation of "__nv_bool caffe2::DispatchHelper<caffe2::TensorTypes<FirstType, Types...>, ExtraArgs...>::call(Op *, const caffe2::Tensor &) [with FirstType=int32_t, Types=<int64_t>, ExtraArgs=<>, Op=caffe2::CUDASparseLengthsWeightedSumOp<float, caffe2::CUDAContext, true>]"
(786): here
caffe2/caffe2/operators/segment_reduction_op_gpu.cu(96): warning: parameter "len_length" was declared but never referenced
detected during:
instantiation of "__nv_bool caffe2::CUDASparseLengthsSumGradientWithIndicesOp<T, Context>::RunOnDevice() [with T=float, Context=caffe2::CUDAContext]"
(1296): here
caffe2/caffe2/sgd/adagrad_fused_op_gpu.cu(1226): warning: variable "N" was declared but never referenced
detected during:
instantiation of "__nv_bool caffe2::DispatchHelper<caffe2::TensorTypes2<FirstType, Types...>, ExtraArgs...>::call(Op *, caffe2::TypeMeta) [with FirstType=float, Types=<c10::Half>, ExtraArgs=<int32_t>, Op=caffe2::CUDARowWiseSparseAdagradFusedWithSparseLengthsSumGradientExactOp<float, int, false, caffe2::CUDAContext>]"
caffe2/caffe2/sgd/adagrad_fused_op_gpu.cu(259): warning: parameter "indices" was declared but never referenced
detected during:
instantiation of "__nv_bool caffe2::CUDARowWiseSparseAdagradFusedWithSparseLengthsSumGradientExactOp<T, TLengths, is_mean, Context>::DoRunWithType2<IndexType,TParam>() [with T=float, TLengths=int, is_mean=false, Context=caffe2::CUDAContext, IndexType=int32_t, TParam=float]"
caffe2/caffe2/core/operator.h(1308): here
caffe2/caffe2/operators/piecewise_linear_transform_op.cu(15): warning: parameter "num_grp" was declared but never referenced
caffe2/caffe2/operators/piecewise_linear_transform_op.cu(50): warning: parameter "M" was declared but never referenced
caffe2/caffe2/operators/piecewise_linear_transform_op.cu(51): warning: parameter "num_grp" was declared but never referenced
caffe2/caffe2/operators/piecewise_linear_transform_op.cu(78): warning: parameter "num_grp" was declared but never referenced
```
Test Plan: Sandcastle
Reviewed By: malfet
Differential Revision: D34034404
fbshipit-source-id: b834088d6a3e204e94bbffe3ac6fdccf9d0176b8
(cherry picked from commit 0148d0de0409ebf14c1019d3191ef9e79f4b7c92)
