fix a bug

JiayiFeng · JiayiFeng · commit 744cc412b779 · 2018-06-04T14:11:25.000+08:00
diff --git a/paddle/fluid/operators/reader/open_files_op.cc b/paddle/fluid/operators/reader/open_files_op.cc
@@ -27,7 +27,7 @@ class MultiFileReader : public framework::ReaderBase {
                   const std::vector<framework::DDim>& dims, size_t thread_num,
                   size_t buffer_size)
       : buffer_size_(buffer_size) {
-    readers_.resize(file_names.size());
+    readers_.reserve(file_names.size());
     for (const std::string& f_name : file_names) {
       readers_.emplace_back(CreateReaderByFileName(f_name, dims));
     }

Original file line number	Diff line number	Diff line change
`@@ -27,7 +27,7 @@ class MultiFileReader : public framework::ReaderBase {`
`27`	`27`	`const std::vector<framework::DDim>& dims, size_t thread_num,`
`28`	`28`	`size_t buffer_size)`
`29`	`29`	`: buffer_size_(buffer_size) {`
`30`		`- readers_.resize(file_names.size());`
	`30`	`+ readers_.reserve(file_names.size());`
`31`	`31`	`for (const std::string& f_name : file_names) {`
`32`	`32`	`readers_.emplace_back(CreateReaderByFileName(f_name, dims));`
`33`	`33`	`}`