Fix the warning and unit test.

paddle/operators/bipartite_match_op.cc

@@ -62,7 +62,7 @@ class BipartiteMatchKernel : public framework::OpKernel<T> {
         if (match_indices[j] != -1) {
           continue;
         }
-        for (int k = 0; k < row_pool.size(); ++k) {
+        for (size_t k = 0; k < row_pool.size(); ++k) {
           int m = row_pool[k];
           // distance is 0 between m-th row and j-th column
           if (dist_data[m * col + j] < kEPS) {

python/paddle/v2/fluid/tests/test_bipartite_match_op.py

@@ -69,7 +69,7 @@ class TestBipartiteMatchOpForWithLoD(OpTest):
         dis = np.random.random((23, 217)).astype('float32')
         match_indices, match_dis = batch_bipartite_match(dis, lod[0])
 
-        self.inputs = {'DisMat': (dis, lod)}
+        self.inputs = {'DistMat': (dis, lod)}
         self.outputs = {
             'ColToRowMatchIndices': (match_indices),
             'ColToRowMatchDis': (match_dis),
@@ -86,7 +86,7 @@ class TestBipartiteMatchOpWithoutLoD(OpTest):
         dis = np.random.random((8, 17)).astype('float32')
         match_indices, match_dis = batch_bipartite_match(dis, lod[0])
 
-        self.inputs = {'DisMat': dis}
+        self.inputs = {'DistMat': dis}
         self.outputs = {
             'ColToRowMatchIndices': (match_indices),
             'ColToRowMatchDis': (match_dis),