diff --git a/binding/python/multiverso/api.py b/binding/python/multiverso/api.py
index d6fb22e..9753b72 100644
--- a/binding/python/multiverso/api.py
+++ b/binding/python/multiverso/api.py
@@ -46,6 +46,10 @@ class TableHandler(object):
         raise NotImplementedError("You must implement the add method.")
 
 
+# types
+C_FLOAT_P = POINTER(c_float)
+
+
 class ArrayTableHandler(TableHandler):
     def __init__(self, size):
         self._handler = c_void_p()
@@ -56,17 +60,19 @@ class ArrayTableHandler(TableHandler):
         '''
         Data type of return value is numpy.ndarray
         '''
-        c_data = (c_float * self._size)()
-        mv_lib.MV_GetArrayTable(self._handler, c_data, self._size)
-        return np.array(list(c_data), dtype=np.dtype("float32"))
+        data = np.zeros((self._size, ), dtype=np.dtype("float32"))
+        mv_lib.MV_GetArrayTable(self._handler, data.ctypes.data_as(C_FLOAT_P), self._size)
+        return data
 
     def add(self, data):
         '''
         Data type of `data` is numpy.ndarray
         '''
-        data = np.array(data)
+        if not isinstance(data, np.ndarray):
+            data = np.array(data)
         assert(data.size == self._size)
-        mv_lib.MV_AddArrayTable(self._handler, (c_float * self._size)(*data.reshape((-1,))), self._size)
+        data = data.astype(np.float32)
+        mv_lib.MV_AddArrayTable(self._handler, data.ctypes.data_as(C_FLOAT_P), self._size)
 
 
 class MatrixTableHandler(TableHandler):
@@ -84,19 +90,17 @@ class MatrixTableHandler(TableHandler):
         to the row_ids
         '''
         if row_ids is None:
-            float_array_type = c_float * (self._num_row * self._num_col)
-            c_data = float_array_type()
-            mv_lib.MV_GetMatrixTableAll(self._handler, c_data, self._size)
-            return np.array(list(c_data), dtype=np.dtype("float32")).reshape((self._num_row, self._num_col))
+            data = np.zeros((self._num_row, self._num_col), dtype=np.dtype("float32"))
+            mv_lib.MV_GetMatrixTableAll(self._handler, data.ctypes.data_as(C_FLOAT_P), self._size)
+            return data
         else:
             row_ids_n = len(row_ids)
             int_array_type = c_int * row_ids_n
-            float_array_type = c_float * (row_ids_n * self._num_col)
-            c_data = float_array_type()
-            mv_lib.MV_GetMatrixTableByRows(self._handler, c_data,
+            data = np.zeros((row_ids_n, self._num_col), dtype=np.dtype("float32"))
+            mv_lib.MV_GetMatrixTableByRows(self._handler, data.ctypes.data_as(C_FLOAT_P),
                                            row_ids_n * self._num_col,
                                            int_array_type(*row_ids), row_ids_n)
-            return np.array(list(c_data), dtype=np.dtype("float32")).reshape((row_ids_n, self._num_col))
+            return data
 
     def add(self, data=None, row_ids=None):
         '''
@@ -106,19 +110,17 @@ class MatrixTableHandler(TableHandler):
             Otherwise we will add the data according to the row_ids
         '''
         assert(data is not None)
-        data = np.array(data)
+        if not isinstance(data, np.ndarray):
+            data = np.array(data)
+        data = data.astype(np.float32)
+
         if row_ids is None:
             assert(data.size == self._size)
-            float_array_type = c_float * (self._num_row * self._num_col)
-            c_data = float_array_type(* data.reshape((-1, )))
-            mv_lib.MV_AddMatrixTableAll(self._handler, c_data, self._size)
+            mv_lib.MV_AddMatrixTableAll(self._handler, data.ctypes.data_as(C_FLOAT_P), self._size)
         else:
             row_ids_n = len(row_ids)
             assert(data.size == row_ids_n * self._num_col)
             int_array_type = c_int * row_ids_n
-            float_array_type = c_float * (self._num_col * row_ids_n)
-
-            c_data = float_array_type(* data.reshape((-1, )))
-            mv_lib.MV_AddMatrixTableByRows(self._handler, c_data,
+            mv_lib.MV_AddMatrixTableByRows(self._handler, data.ctypes.data_as(C_FLOAT_P),
                                            row_ids_n * self._num_col,
                                            int_array_type(*row_ids), row_ids_n)
diff --git a/binding/python/multiverso/theano_ext/lasagne_ext/param_manager.py b/binding/python/multiverso/theano_ext/lasagne_ext/param_manager.py
index 787cda2..7926e74 100644
--- a/binding/python/multiverso/theano_ext/lasagne_ext/param_manager.py
+++ b/binding/python/multiverso/theano_ext/lasagne_ext/param_manager.py
@@ -50,12 +50,10 @@ class MVNetParamManager(object):
         1) calc all the delta of params in the network and add the delta to multiverso server
         2) get the latest value from the multiverso server
         '''
-        latest_network_params = []
-        for arr in lasagne.layers.get_all_param_values(self.network):
-            latest_network_params.extend([i for i in np.nditer(arr)])
-        latest_network_params = np.array(latest_network_params)
+        cur_network_params = np.concatenate([
+            arr.reshape(-1) for arr in lasagne.layers.get_all_param_values(self.network)])
 
-        params_delta = latest_network_params - self.all_param_list
+        params_delta = cur_network_params - self.all_param_list
         self.tbh.add(params_delta)
         self.all_param_list = self.tbh.get()
         self._set_all_param_to_net()