diff --git a/hpvm/projects/keras/frontend/approxhpvm_translator.py b/hpvm/projects/keras/frontend/approxhpvm_translator.py
index da4464ee1b4e3dca61fd1a70a5870be651ce6187..59bc0d17c0605672153a542e850d98cf9d868d77 100644
--- a/hpvm/projects/keras/frontend/approxhpvm_translator.py
+++ b/hpvm/projects/keras/frontend/approxhpvm_translator.py
@@ -248,7 +248,7 @@ class TensorRtTranslator:
     flops = weights.shape[0] * weights.shape[1]
     DEBUG ("dense_flops =  ", flops)
 
-    self.json_str += "\"linear_" + str(self.op_count) + "\" : " + str(flops) + "\n"
+    self.json_str += "\"linear_" + str(self.op_count) + "\" : " + str(flops) + ", \n"
     self.knobs_str += "\"linear_" + str(self.op_count) + "\" : ["  + baseline_knobs + "], \n"
     self.op_count += 1
         
@@ -951,20 +951,20 @@ class TensorRtTranslator:
     f = open(dir_prefix + "/tuner.json", "w+")
     f.write("{ \n\n")
     
-    op_cost_str = " \"op_cost\" = { \n"
+    op_cost_str = " \"op_cost\" : { \n"
     op_cost_str += self.json_str[:-3]
     #f.write(self.json_str)
-    op_cost_str += "\n } \n\n"
+    op_cost_str += "\n }, \n\n"
     f.write(op_cost_str)
 
     knobs_speedup_str = "\n \"knob_speedup\" : { \n"
     for key in knobs_speedups:
       knobs_speedup_str += "\"" + str(key) + "\" : " + str(knobs_speedups[key]) + ", \n"
       
-    f.write(knobs_speedup_str[:-3] + "\n} \n\n")
+    f.write(knobs_speedup_str[:-3] + "\n}, \n\n")
     
     
-    layer_knobs_str = " \"op_knobs\" = { \n"
+    layer_knobs_str = " \"op_knobs\" : { \n"
     layer_knobs_str += self.knobs_str[:-3]
     layer_knobs_str += " \n\n } \n\n"
     f.write(layer_knobs_str)