fix cube-builder path not found error in criteo_ctr_with_cube example

python/examples/criteo_ctr_with_cube/cube_prepare.sh

@@ -17,6 +17,6 @@
 mkdir -p cube_model
 mkdir -p cube/data
 ./seq_generator ctr_serving_model/SparseFeatFactors ./cube_model/feature  
-./cube/cube-builder -dict_name=test_dict -job_mode=base -last_version=0 -cur_version=0 -depend_version=0 -input_path=./cube_model -output_path=./cube/data -shard_num=1  -only_build=false
+./cube/cube-builder -dict_name=test_dict -job_mode=base -last_version=0 -cur_version=0 -depend_version=0 -input_path=./cube_model -output_path=${PWD}/cube/data -shard_num=1  -only_build=false
 mv ./cube/data/0_0/test_dict_part0/* ./cube/data/
 cd cube && ./cube 

python/examples/criteo_ctr_with_cube/cube_quant_prepare.sh

@@ -17,6 +17,6 @@
 mkdir -p cube_model
 mkdir -p cube/data
 ./seq_generator ctr_serving_model/SparseFeatFactors ./cube_model/feature 8  
-./cube/cube-builder -dict_name=test_dict -job_mode=base -last_version=0 -cur_version=0 -depend_version=0 -input_path=./cube_model -output_path=./cube/data -shard_num=1  -only_build=false
+./cube/cube-builder -dict_name=test_dict -job_mode=base -last_version=0 -cur_version=0 -depend_version=0 -input_path=./cube_model -output_path=${PWD}/cube/data -shard_num=1  -only_build=false
 mv ./cube/data/0_0/test_dict_part0/* ./cube/data/
 cd cube && ./cube