diff --git a/components/nn/include/maix_nn_self_learn_classifier.hpp b/components/nn/include/maix_nn_self_learn_classifier.hpp
index 2604cd08..16d39ad6 100644
--- a/components/nn/include/maix_nn_self_learn_classifier.hpp
+++ b/components/nn/include/maix_nn_self_learn_classifier.hpp
@@ -7,7 +7,6 @@
 #pragma once
 
 #include "maix_basic.hpp"
-#include "maix_nn_maixcam.hpp"
 
 namespace maix::nn
 {
@@ -272,10 +271,7 @@ namespace maix::nn
          * @return learn epoch(times), 0 means learn nothing.
          * @maixpy maix.nn.SelfLearnClassifier.learn
          */
-        int learn()
-        {
-            return maix_nn_self_learn_classifier_learn(_features, _features_sample, _feature_num);
-        }
+        int learn();
 
         /**
          * Clear all class and samples
diff --git a/components/nn/src/maix_nn.cpp b/components/nn/src/maix_nn.cpp
index 62e7dc33..216b0f63 100644
--- a/components/nn/src/maix_nn.cpp
+++ b/components/nn/src/maix_nn.cpp
@@ -197,4 +197,13 @@ namespace maix::nn
         return _impl->forward_image(img, mean, scale, fit, copy_result);
     }
 
+    int SelfLearnClassifier::learn()
+    {
+        #if PLATFORM_MAIXCAM
+            return maix_nn_self_learn_classifier_learn(_features, _features_sample, _feature_num);
+        #else
+            throw err::Exception(err::ERR_NOT_IMPL);
+        #endif
+    }
+
 } // namespace maix::nn
diff --git a/components/vision/port/linux/maix_jpg_stream.cpp b/components/vision/port/linux/maix_jpg_stream.cpp
index 1d62eb15..bd61e2d0 100644
--- a/components/vision/port/linux/maix_jpg_stream.cpp
+++ b/components/vision/port/linux/maix_jpg_stream.cpp
@@ -18,18 +18,18 @@ namespace maix::http
 		}
 
         err::Err JpegStreamer::start() {
-
+			return err::ERR_NOT_IMPL;
 		}
 
         err::Err JpegStreamer::stop() {
-
+			return err::ERR_NOT_IMPL;
 		}
 
         err::Err JpegStreamer::write(image::Image *img) {
-
+			return err::ERR_NOT_IMPL;
 		}
 
         err::Err JpegStreamer::set_html(std::string data) {
-
+			return err::ERR_NOT_IMPL;
 		}
 }
\ No newline at end of file