remove `allow_inefficient_sparse_update` since it's only defined but never used.

doc/howto/usage/cmd_parameter/arguments_cn.md

@@ -127,11 +127,6 @@
 <td class="left">√</td><td class="left">√</td><td class="left"></td><td class="left"></td>
 </tr>
 
-<tr>
-<td class="left">allow_inefficient_sparse_update</td>
-<td class="left">√</td><td class="left">√</td><td class="left"></td><td class="left"></td>
-</tr>
-
 <tr>
 <td class="left">start_pass</td>
 <td class="left">√</td><td class="left">√</td><td class="left"></td><td class="left"></td>

doc/howto/usage/cmd_parameter/arguments_en.md

@@ -127,11 +127,6 @@ It looks like there are a lot of arguments. However, most of them are for develo
 <td class="left">√</td><td class="left">√</td><td class="left"></td><td class="left"></td>
 </tr>
 
-<tr>
-<td class="left">allow_inefficient_sparse_update</td>
-<td class="left">√</td><td class="left">√</td><td class="left"></td><td class="left"></td>
-</tr>
-
 <tr>
 <td class="left">start_pass</td>
 <td class="left">√</td><td class="left">√</td><td class="left"></td><td class="left"></td>

doc/howto/usage/cmd_parameter/detail_introduction_cn.md

@@ -306,10 +306,6 @@
   - 指示是否显示参数服务器上的稀疏参数分布的日志细节.
   - 类型: bool (默认: 0).
 
-* `--allow_inefficient_sparse_update`
-  - 指示是否允许低效率的稀疏更新.
-  - 类型: bool (默认: 0).
-
 * `--check_sparse_distribution_batches`
   - 每运行多少个批次执行一次稀疏参数分布的检查.
   - 类型: int32 (默认: 100).

doc/howto/usage/cmd_parameter/detail_introduction_en.md

@@ -310,10 +310,6 @@
   - show log details for sparse parameter distribution in pserver.
   - type: bool (default: 0).
 
-* `--allow_inefficient_sparse_update`
-  - Whether to allow inefficient sparse update.
-  - type: bool (default: 0).
-
 * `--check_sparse_distribution_batches`
   - Running sparse parameter distribution check every so many batches.
   - type: int32 (default: 100).

paddle/math/SparseRowMatrix.cpp

@@ -24,10 +24,6 @@ limitations under the License. */
 #include "paddle/utils/Thread.h"
 #include "paddle/utils/Util.h"
 
-DEFINE_bool(allow_inefficient_sparse_update,
-            false,
-            "Whether to allow inefficient sparse update");
-
 namespace paddle {
 
 const unsigned int SparseRowCpuMatrix::kUnusedId_ = -1U;

paddle/math/SparseRowMatrix.h

@@ -21,8 +21,6 @@ limitations under the License. */
 #include "RowBuffer.h"
 #include "paddle/utils/Util.h"
 
-DECLARE_bool(allow_inefficient_sparse_update);
-
 namespace paddle {
 
 /**
@@ -183,11 +181,10 @@ protected:
   inline void checkStoreSize() {
     if (buf_->isAutoGrowth()) {
       if (buf_->getRowCount() > 0.5 * height_) {
-        LOG(WARNING)
-            << "There are more than 0.5*height (" << localIndices_->size()
-            << ") rows are used for sparse "
-            << "update, which is not efficient. Considering not use "
-            << "sparse_update or set --allow_inefficient_sparse_update=true";
+        LOG(WARNING) << "There are more than 0.5*height ("
+                     << localIndices_->size() << ") rows are used for sparse "
+                     << "update, which is not efficient. Considering not use "
+                     << "sparse_update.";
       }
     } else {
       CHECK_LE(localIndices_->size(), buf_->getRowCount());