fix typos (#336)

include/LightGBM/network.h

@@ -41,7 +41,7 @@ public:
 *        When number of machines is not power of 2, need group machines into power of 2 group.
 *        And we can let each group has at most 2 machines.
 *        if the group only has 1 machine. this machine is the normal node
-*        if the grou has 2 machines, this group will have two type of nodes, one is the leader.
+*        if the group has 2 machines, this group will have two type of nodes, one is the leader.
 *        leader will represent this group and communication with others.
 */
 enum RecursiveHalvingNodeType {

src/io/sparse_bin.hpp

@@ -25,7 +25,7 @@ public:
     uint32_t min_bin, uint32_t max_bin, uint32_t default_bin)
     : bin_data_(bin_data), min_bin_(static_cast<VAL_T>(min_bin)),
     max_bin_(static_cast<VAL_T>(max_bin)),
-    default_bin_(static_cast<uint8_t>(default_bin)) {
+    default_bin_(static_cast<VAL_T>(default_bin)) {
     if (default_bin_ == 0) {
       bias_ = 1;
     } else {
@@ -198,7 +198,7 @@ public:
       [](const std::pair<data_size_t, VAL_T>& a, const std::pair<data_size_t, VAL_T>& b) {
       return a.first < b.first;
     });
-    // load detla array
+    // load delta array
     LoadFromPair(idx_val_pairs);
   }
 

src/network/linkers_socket.cpp

@@ -25,7 +25,7 @@ Linkers::Linkers(NetworkConfig config) {
   local_listen_port_ = config.local_listen_port;
   socket_timeout_ = config.time_out;
   rank_ = -1;
-  // parser clients from file
+  // parse clients from file
   ParseMachineList(config.machine_list_filename.c_str());
 
   if (rank_ == -1) {