Update README.md

README.md

@@ -82,7 +82,7 @@ when batch_size is large (16, 32, 64, 128), throughput_amp > throughput_tf32.
 
 <img src="https://github.com/xuagu37/Benchmark_nnU-Net_for_PyTorch/blob/main/figures/benchmark_throughput_batch_size.png" width="400">
 
-- Observation 2: The coefficient of variation of throughput for 100 iterations is smallest when batch_size = 128.  
+**Observation 2**: The coefficient of variation of throughput for 100 iterations is smallest when batch_size = 128.  
 
 <img src="https://github.com/xuagu37/Benchmark_nnU-Net_for_PyTorch/blob/main/figures/benchmark_throughput_cv.png" width="400">