remove mpi flag mca btl_vader_single_copy_mechanism none on MNIST tests for SMP (#1882)

Author: akhilmehra

training/distributed_training/pytorch/model_parallel/mnist/pytorch_smmodelparallel_mnist.ipynb

@@ -140,7 +140,6 @@
    "source": [
     "sagemaker_session = sagemaker.session.Session(boto_session=session)\n",
     "mpioptions = \"-verbose -x orte_base_help_aggregate=0 \"\n",
-    "mpioptions += \"--mca btl_vader_single_copy_mechanism none \"\n",
     "\n",
     "all_experiment_names = [exp.experiment_name for exp in Experiment.list()]\n",
     "\n",

training/distributed_training/tensorflow/model_parallel/mnist/tensorflow_smmodelparallel_mnist.ipynb

@@ -150,7 +150,6 @@
    "source": [
     "sagemaker_session = sagemaker.session.Session(boto_session=session)\n",
     "mpioptions = \"-verbose -x orte_base_help_aggregate=0 \"\n",
-    "mpioptions += \"--mca btl_vader_single_copy_mechanism none \"\n",
     "\n",
     "#choose an experiment name (only need to create it once)\n",
     "experiment_name = \"SM-MP-DEMO\"\n",