modify init to _init

mindspore/train/model.py

@@ -267,7 +267,7 @@ class Model:
 
         return dataset_helper, network
 
-    def init(self, train_dataset=None, valid_dataset=None):
+    def _init(self, train_dataset=None, valid_dataset=None, sink_size=-1):
         """
         Initialize compute graphs and data graphs with the sink mode.
 
@@ -279,17 +279,7 @@ class Model:
                                      initialized. Default: None.
             valid_dataset (Dataset): A evaluating dataset iterator. If `valid_dataset` is defined, evaluation graphs
                                      will be initialized, and `metrics` in `Model` can not be None. Default: None.
-
-        Examples:
-            >>> train_dataset = get_train_dataset()
-            >>> valid_dataset = get_valid_dataset()
-            >>> net = Net()
-            >>> loss = nn.SoftmaxCrossEntropyWithLogits(is_grad=False, sparse=True)
-            >>> optim = Momentum(params=net.trainable_params(), learning_rate=0.1, momentum=0.9)
-            >>> model = Model(net, loss_fn=loss, optimizer=optim, metrics={'acc'})
-            >>> model.init(train_dataset, valid_dataset)
-            >>> model.train(2, train_dataset)
-            >>> model.eval(valid_dataset)
+            sink_size (int): Control the amount of data in each sink. Default: -1.
         """
         if context.get_context("mode") != context.GRAPH_MODE or context.get_context("device_target") != "Ascend":
             raise RuntimeError('Pre-init process only supports GRAPH MODE and Ascend target currently.')
@@ -309,7 +299,8 @@ class Model:
                                                                         is_train=True,
                                                                         phase='train',
                                                                         dataset=train_dataset,
-                                                                        dataset_sink_mode=True)
+                                                                        dataset_sink_mode=True,
+                                                                        sink_size=sink_size)
             self._train_network = train_network
             for inputs in train_dataset_helper:
                 self._train_network.compile(*inputs)

tests/st/networks/models/resnet50/test_resnet50_imagenet.py

@@ -201,11 +201,6 @@ def train_process(q, device_id, epoch_size, device_num, enable_hccl):
                   metrics={'acc': DistAccuracy(batch_size=config.eval_batch_size, device_num=device_num)},
                   eval_network=dist_eval_network)
 
-    # model init
-    print("init_start", device_id)
-    model.init(dataset, eval_dataset)
-    print("init_stop", device_id)
-
     # callbacks
     loss_cb = LossGet(1, step_size)
 

tests/ut/python/train/test_training.py

@@ -221,25 +221,6 @@ def test_model_build_abnormal_string():
         assert err
 
 
-def test_model_init():
-    """ test_model_init_error """
-    train_dataset = get_dataset()
-    eval_dataset = get_dataset()
-
-    with pytest.raises(RuntimeError):
-        context.set_context(mode=context.PYNATIVE_MODE)
-        get_model().init(train_dataset)
-
-    context.set_context(mode=context.GRAPH_MODE)
-    get_model().init(train_dataset)
-    get_model(metrics={'acc'}).init(eval_dataset)
-
-    with pytest.raises(RuntimeError):
-        get_model().init(train_dataset, eval_dataset)
-    with pytest.raises(ValueError):
-        get_model().init()
-
-
 def test_init_model_error():
     """ test_init_model_error """
     net = nn.ReLU()