[KVstore] Change sizeof(float) to dtype.bits / 8 (#1452)

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src/graph/network.cc

@@ -669,7 +669,7 @@ DGL_REGISTER_GLOBAL("network._CAPI_FastPull")
         row_size *= local_data->shape[i];
       }
     }
-    row_size *= sizeof(float);
+    row_size *= (local_data->dtype.bits / 8);
     // Get local id and remote id
     if (str_flag.compare("has_g2l") == 0) {
       NDArray g2l = args[11];
@@ -716,6 +716,8 @@ DGL_REGISTER_GLOBAL("network._CAPI_FastPull")
 #ifndef _WIN32  // windows does not support rand_r()
         int s_id = (rand_r(&seed) % (higher-lower+1))+lower;
         send_kv_message(sender, &kv_msg, s_id, !AUTO_FREE);
+#else
+        LOG(FATAL) << "KVStore does not support Windows yet.";
 #endif
         msg_count++;
       }