update

Author: freelw

README.md

@@ -219,7 +219,7 @@ This model was trained for 8 epochs using the full text of The Time Machine nove
 
 To verify some functions more quickly, I have introduced a handwritten digit recognition program.
 
-`
+```
 ./handwritten_recognition 
 images magic : 2051
 label magic : 2049
@@ -230,22 +230,23 @@ Actions:
 evaluating :  [10000/10000] correct : 9501
 epoch : 9 [50000/50000] loss : 0.150985
 evaluating :  [10000/10000] correct : 9493
-`
+```
 
 ### graphviz supported
 
 You can add a line of code like this to the program to output an out.dot file that records the tensor computation topology. For example, in mnist.cpp:
-`
+
+```
 printAllActions();
 printDotGraph(); // here
 allocMemAndInitTensors();
-`
+```
 
 If you have Graphviz installed, you can use the following command to convert the out.dot file into a PNG image:
 
-`
+```
 dot -Tpng out.dot -o out.png
-`
+```
 
 Here's an example from my side where a PNG file is generated as output.