fix bugs

src/api/operator/numpy/np_matrix_op.cc

@@ -613,6 +613,7 @@ MXNET_REGISTER_API("_npi.tril_indices")
     ndarray_handles.emplace_back(ndoutputs[i]);
   }
   *ret = ADT(0, ndarray_handles.begin(), ndarray_handles.end());
+});
 
 MXNET_REGISTER_API("_npi.vstack")
 .set_body([](runtime::MXNetArgs args, runtime::MXNetRetValue* ret) {
@@ -627,7 +628,7 @@ MXNET_REGISTER_API("_npi.vstack")
   SetAttrDict<op::NumpyVstackParam>(&attrs);
   int num_outputs = 0;
   std::vector<NDArray*> inputs_vec(args.size(), nullptr);
-  for (int i = 0; i < args_size; ++i) {
+  for (int i = 0; i < args.size(); ++i) {
     inputs_vec[i] = args[i].operator mxnet::NDArray*();
   }
   NDArray** inputs = inputs_vec.data();

src/api/operator/numpy/random/np_multinomial_op.cc

@@ -24,8 +24,8 @@
 #include <mxnet/api_registry.h>
 #include <mxnet/runtime/packed_func.h>
 #include <vector>
-#include "../utils.h"
-#include "../../../operator/numpy/random/np_multinomial_op.h"
+#include "../../utils.h"
+#include "../../../../operator/numpy/random/np_multinomial_op.h"
 
 namespace mxnet {
 
@@ -39,7 +39,7 @@ MXNET_REGISTER_API("_npi.multinomial")
   int num_inputs = 0;
 
   // parse int
-  param.n = arg[0].operator int();
+  param.n = args[0].operator int();
 
   // parse pvals
   if (args[1].type_code() == kNull) {

src/operator/numpy/random/np_multinomial_op.h

@@ -57,7 +57,7 @@ struct NumpyMultinomialParam : public dmlc::Parameter<NumpyMultinomialParam> {
       "Default is None, in which case a single value is returned.");
   }
   void SetAttrDict(std::unordered_map<std::string, std::string>* dict) {
-    std::ostringstream n, pvals, size;
+    std::ostringstream n_s, pvals_s, size_s;
     n_s << n;
     pvals_s << pvals;
     size_s << size;