fix: dbg (#1993)

1. config["Metric"]["Train"] may be None
2. fliter -> list

ppcls/engine/engine.py

@@ -153,7 +153,7 @@ class Engine(object):
 
         # build metric
         if self.mode == 'train' and "Metric" in self.config and "Train" in self.config[
-                "Metric"]:
+                "Metric"] and self.config["Metric"]["Train"]:
             metric_config = self.config["Metric"]["Train"]
             if hasattr(self.train_dataloader, "collate_fn"
                        ) and self.train_dataloader.collate_fn is not None:

ppcls/metric/metrics.py

@@ -61,7 +61,7 @@ class TopkAcc(AvgMetrics):
             self.avg_meters[f"top{k}"].update(metric_dict[f"top{k}"],
                                               x.shape[0])
 
-        self.topk = filter(lambda k: k <= output_dims, self.topk)
+        self.topk = list(filter(lambda k: k <= output_dims, self.topk))
 
         return metric_dict