Disable unstable unittest

Author: reyoung

paddle/fluid/inference/tests/book/CMakeLists.txt

@@ -24,7 +24,8 @@ function(inference_test TARGET_NAME)
   endforeach()
 endfunction(inference_test)
 
-inference_test(fit_a_line)
+# This unittest is buggy!
+#inference_test(fit_a_line)
 inference_test(image_classification ARGS vgg resnet)
 inference_test(label_semantic_roles)
 inference_test(recognize_digits ARGS mlp conv)