reverted changes in upstream

1 files changed, 2 insertions, 3 deletions

diff --git a/utils/fast_sparse_vector.h b/utils/fast_sparse_vector.h
index 2c49948c..af832950 100644
--- a/utils/fast_sparse_vector.h
+++ b/utils/fast_sparse_vector.h
@@ -196,7 +196,7 @@ class FastSparseVector {
     else
       return local_size_;
   }
-  size_t size_nonzero() const {
+  size_t num_nonzero() const {
     size_t sz = 0;
     const_iterator it = this->begin();
     for (; it != this->end(); ++it) {
@@ -229,12 +229,11 @@ class FastSparseVector {
     return *this;
   }
   template <typename O>
-  inline FastSparseVector<O>& plus_eq_v_times_s(const FastSparseVector<O>& other, const O scalar) {
+  inline void plus_eq_v_times_s(const FastSparseVector<O>& other, const O scalar) {
     const typename FastSparseVector<O>::const_iterator end = other.end();
     for (typename FastSparseVector<O>::const_iterator it = other.begin(); it != end; ++it) {
       get_or_create_bin(it->first) += it->second * scalar;
     }
-    return *this;
   }
   inline FastSparseVector& operator-=(const FastSparseVector& other) {
     const typename FastSparseVector::const_iterator end = other.end();