add scalar sample

server/visualdl/lib.py

 import pprint
 import re
 import urllib
+import random
 from tempfile import NamedTemporaryFile
 
 import numpy as np
@@ -37,18 +38,11 @@ def get_scalar(storage, mode, tag, num_records=100):
         timestamps = scalar.timestamps()
 
         data = zip(timestamps, ids, records)
+        if len(data) <= num_records:
+            return data
 
-        result = []
-        # sample some records to reduce data size
-        if len(data) > num_records:
-            span = len(result) * 1. / num_records
-            id = 0
-            while id <= num_records:
-                result.append(data[int(id)])
-                id += span
-        else:
-            result = data
-        return result
+        samples = sorted(random.sample(xrange(len(data)), num_records))
+        return [data[i] for i in samples]
 
 
 def get_image_tags(storage):

server/visualdl/visual_dl.py

@@ -51,7 +51,7 @@ server_path = os.path.abspath(os.path.dirname(sys.argv[0]))
 static_file_path = "./frontend/dist/"
 mock_data_path = "./mock_data/"
 
-storage = storage.StorageReader(options.logdir)
+storage = storage.LogReader(options.logdir)
 
 
 # return data
@@ -160,4 +160,4 @@ def graph():
 
 if __name__ == '__main__':
     logger.info(" port=" + str(options.port))
-    app.run(debug=True, host=options.host, port=options.port)
+    app.run(debug=False, host=options.host, port=options.port)