fix bug for ctr_reader for svm data (#17575)

* fix bug for ctr_reader test=develop

* fix svm data test=develop

fix svm data test=develop

paddle/fluid/operators/reader/ctr_reader.cc

@@ -52,9 +52,9 @@ static inline void parse_line(
     std::unordered_map<std::string, std::vector<int64_t>>* slot_to_data) {
   std::vector<std::string> ret;
   string_split(line, ' ', &ret);
-  *label = std::stoi(ret[2]) > 0;
+  *label = std::stoi(ret[0]) > 0;
 
-  for (size_t i = 3; i < ret.size(); ++i) {
+  for (size_t i = 1; i < ret.size(); ++i) {
     const std::string& item = ret[i];
     std::vector<std::string> feasign_and_slot;
     string_split(item, ':', &feasign_and_slot);

paddle/fluid/operators/reader/ctr_reader_test.cc

@@ -91,16 +91,16 @@ static inline void check_all_data(
 
 TEST(CTR_READER, read_data) {
   const std::vector<std::string> ctr_data = {
-      "aaaa 1 0 0:6002 1:6003 2:6004 3:6005 4:6006 -1\n",
-      "bbbb 1 0 5:6003 6:6003 7:6003 8:6004 9:6004 -1\n",
-      "cccc 1 1 10:6002 11:6002 12:6002 13:6002 14:6002 -2\n",
-      "dddd 1 0 15:6003 16:6003 17:6003 18:6003 19:6004 -3\n",
-      "1111 1 1 20:6001 21:6001 22:6001 23:6001 24:6001 12\n",
-      "2222 1 1 25:6004 26:6004 27:6004 28:6005 29:6005 aa\n",
-      "3333 1 0 30:6002 31:6003 32:6004 33:6004 34:6005 er\n",
-      "eeee 1 1 35:6003 36:6003 37:6005 38:6005 39:6005 dd\n",
-      "ffff 1 1 40:6002 41:6003 42:6004 43:6004 44:6005 66\n",
-      "gggg 1 1 46:6006 45:6006 47:6003 48:6003 49:6003 ba\n",
+      "0 0:6002 1:6003 2:6004 3:6005 4:6006 \n",
+      "0 5:6003 6:6003 7:6003 8:6004 9:6004 \n",
+      "1 10:6002 11:6002 12:6002 13:6002 14:6002 \n",
+      "0 15:6003 16:6003 17:6003 18:6003 19:6004 \n",
+      "1 20:6001 21:6001 22:6001 23:6001 24:6001 \n",
+      "1 25:6004 26:6004 27:6004 28:6005 29:6005 \n",
+      "0 30:6002 31:6003 32:6004 33:6004 34:6005 \n",
+      "1 35:6003 36:6003 37:6005 38:6005 39:6005 \n",
+      "1 40:6002 41:6003 42:6004 43:6004 44:6005 \n",
+      "1 46:6006 45:6006 47:6003 48:6003 49:6003 \n",
   };
   std::string gz_file_name = "test_ctr_reader_data.gz";
   generatedata(ctr_data, gz_file_name);