!8397 fix api error and get next info

From: @gong_zi_yan
Reviewed-by: @stsuteng,@kisnwang
Signed-off-by: @stsuteng

mindspore/ccsrc/frontend/parallel/ops_info/get_next_info.cc

@@ -203,11 +203,11 @@ Status GetNextInfo::InferReplaceOps(const StrategyPtr &) {
       MS_LOG(ERROR) << name_ << " : The dev num is 0.";
       return FAILED;
     }
-    if (out_shapes[i][0] % dev_num_ != 0) {
-      MS_LOG(ERROR) << name_ << " : batch num cannot floor div dev num.";
-      return FAILED;
-    }
     if (!full_batch) {
+      if (out_shapes[i][0] % dev_num_ != 0) {
+        MS_LOG(ERROR) << name_ << " : batch num cannot floor div dev num.";
+        return FAILED;
+      }
       out_shapes[i][0] = out_shapes[i][0] / dev_num_;
     }
   }

mindspore/nn/optim/lamb.py

@@ -238,7 +238,7 @@ class Lamb(Optimizer):
     Examples:
         >>> net = Net()
         >>> #1) All parameters use the same learning rate and weight decay
-        >>> optim = nn.Lamb(params=net.trainable_params())
+        >>> optim = nn.Lamb(params=net.trainable_params(learning_rate=0.1))
         >>>
         >>> #2) Use parameter groups and set different values
         >>> poly_decay_lr = learning_rate_schedule.PolynomialDecayLR()

mindspore/nn/wrap/grad_reducer.py

@@ -254,6 +254,8 @@ class DistributedGradReducer(Cell):
         >>> from mindspore.context import ParallelMode
         >>> from mindspore import nn
         >>> from mindspore import ParameterTuple
+        >>> from mindspore.parallel._utils import (_get_device_num, _get_gradients_mean,
+        >>>                                        _get_parallel_mode)
         >>>
         >>> device_id = int(os.environ["DEVICE_ID"])
         >>> context.set_context(mode=context.GRAPH_MODE, device_target="Ascend", save_graphs=True,
@@ -279,11 +281,8 @@ class DistributedGradReducer(Cell):
         >>>                                            ParallelMode.HYBRID_PARALLEL]:
         >>>             self.reducer_flag = True
         >>>         if self.reducer_flag:
-        >>>             mean = context.get_auto_parallel_context("gradients_mean")
-        >>>             if mean.get_device_num_is_set():
-        >>>                 degree = context.get_auto_parallel_context("device_num")
-        >>>             else:
-        >>>                 degree = get_group_size()
+        >>>             mean = _get_gradients_mean()
+        >>>             degree = _get_device_num()
         >>>             self.grad_reducer = nn.DistributedGradReducer(optimizer.parameters, mean, degree)
         >>>
         >>>     def construct(self, *args):