Adding another example for is_cpu_ps=False

tutorials/image/cifar10_estimator/README.md

@@ -33,7 +33,7 @@ $ python cifar10_main.py --data_dir=/prefix/to/downloaded/data/cifar-10-batches-
                          --num_gpus=0 \
                          --train_steps=1000
 
-# Run the model on CPU and 2 GPUs. After training, it runs the evaluation.
+# Run the model on 2 GPUs using CPU as parameter server. After training, it runs the evaluation.
 $ python cifar10_main.py --data_dir=/prefix/to/downloaded/data/cifar-10-batches-bin \
                          --model_dir=/tmp/cifar10 \
                          --is_cpu_ps=True \
@@ -41,5 +41,13 @@ $ python cifar10_main.py --data_dir=/prefix/to/downloaded/data/cifar-10-batches-
                          --num_gpus=2 \
                          --train_steps=1000
 
+# Run the model on 2 GPUs usinc GPU as parameter server. After training, it runs the evaluation.
+$ python cifar10_main.py --data_dir=/prefix/to/downloaded/data/cifar-10-batches-bin \
+                         --model_dir=/tmp/cifar10 \
+                         --is_cpu_ps=False \
+                         --force_gpu_compatible=True \
+                         --num_gpus=2 \
+                         --train_steps=1000
+
 # There are more command line flags to play with; check cifar10_main.py for details.
 ```