resize assign_value output tensor. test=develop

lite/core/mir/elimination/assign_value_eliminate_pass.cc

@@ -44,12 +44,15 @@ class Eliminator : public FuseBase {
     auto* scope = assign_node->stmt()->op()->scope();
     auto* op_info = assign_node->stmt()->op()->op_info();
     auto shape = op_info->GetAttr<std::vector<int>>("shape");
+    std::vector<int64_t> out_shape;
+    for (size_t i = 0; i < shape.size(); i++) out_shape.push_back(shape[i]);
     auto dtype = op_info->GetAttr<int>("dtype");
     auto fp32_values = op_info->GetAttr<std::vector<float>>("fp32_values");
     auto int32_values = op_info->GetAttr<std::vector<int>>("int32_values");
     auto* out = matched.at("out");
-    auto* out_tensor = scope->FindVar(out->arg()->name)
-                           ->GetMutable<lite::Tensor>();
+    auto* out_tensor =
+        scope->FindVar(out->arg()->name)->GetMutable<lite::Tensor>();
+    out_tensor->Resize(out_shape);
     if (dtype == static_cast<int>(lite::core::FluidType::INT32)) {
       TensorFromVector(int32_values, out_tensor);
     } else if (dtype == static_cast<int>(lite::core::FluidType::FP32)) {
@@ -58,7 +61,6 @@ class Eliminator : public FuseBase {
       LOG(FATAL) << "Unsupported dtype for assign_value_op:" << dtype;
     }
     GraphSafeRemoveNodes(graph, {matched.at("assign_value")});
-
   }
 };