remove default when action is store_true in arguments

examples/run_classifier.py

@@ -333,15 +333,12 @@ def main():
                              "Sequences longer than this will be truncated, and sequences shorter \n"
                              "than this will be padded.")
     parser.add_argument("--do_train",
-                        default=False,
                         action='store_true',
                         help="Whether to run training.")
     parser.add_argument("--do_eval",
-                        default=False,
                         action='store_true',
                         help="Whether to run eval on the dev set.")
     parser.add_argument("--do_lower_case",
-                        default=False,
                         action='store_true',
                         help="Set this flag if you are using an uncased model.")
     parser.add_argument("--train_batch_size",
@@ -366,7 +363,6 @@ def main():
                         help="Proportion of training to perform linear learning rate warmup for. "
                              "E.g., 0.1 = 10%% of training.")
     parser.add_argument("--no_cuda",
-                        default=False,
                         action='store_true',
                         help="Whether not to use CUDA when available")
     parser.add_argument("--local_rank",
@@ -382,7 +378,6 @@ def main():
                         default=1,
                         help="Number of updates steps to accumulate before performing a backward/update pass.")
     parser.add_argument('--fp16',
-                        default=False,
                         action='store_true',
                         help="Whether to use 16-bit float precision instead of 32-bit")
     parser.add_argument('--loss_scale',