diff --git a/gnes/client/cli.py b/gnes/client/cli.py
index e2d04c5e..b44d4d22 100644
--- a/gnes/client/cli.py
+++ b/gnes/client/cli.py
@@ -17,8 +17,7 @@
 import sys
 import time
 import zipfile
-from math import ceil
-from typing import List
+from typing import List, Generator
 
 from termcolor import colored
 
@@ -29,25 +28,25 @@
 class CLIClient(GrpcClient):
     def __init__(self, args):
         super().__init__(args)
-        getattr(self, self.args.mode)(self.read_all())
+        getattr(self, self.args.mode)()
         self.close()
 
-    def train(self, all_bytes: List[bytes]):
-        with ProgressBar(all_bytes, self.args.batch_size, task_name=self.args.mode) as p_bar:
-            for _ in self._stub.StreamCall(RequestGenerator.train(all_bytes,
+    def train(self):
+        with ProgressBar(task_name=self.args.mode) as p_bar:
+            for _ in self._stub.StreamCall(RequestGenerator.train(self.bytes_generator,
                                                                   doc_id_start=self.args.start_doc_id,
                                                                   batch_size=self.args.batch_size)):
                 p_bar.update()
 
-    def index(self, all_bytes: List[bytes]):
-        with ProgressBar(all_bytes, self.args.batch_size, task_name=self.args.mode) as p_bar:
-            for _ in self._stub.StreamCall(RequestGenerator.index(all_bytes,
+    def index(self):
+        with ProgressBar(task_name=self.args.mode) as p_bar:
+            for _ in self._stub.StreamCall(RequestGenerator.index(self.bytes_generator,
                                                                   doc_id_start=self.args.start_doc_id,
                                                                   batch_size=self.args.batch_size)):
                 p_bar.update()
 
-    def query(self, all_bytes: List[bytes]):
-        for idx, q in enumerate(all_bytes):
+    def query(self):
+        for idx, q in enumerate(self.bytes_generator):
             for req in RequestGenerator.query(q, request_id_start=idx, top_k=self.args.top_k):
                 resp = self._stub.Call(req)
                 self.query_callback(req, resp)
@@ -77,45 +76,51 @@ def read_all(self) -> List[bytes]:
 
         return all_bytes
 
+    @property
+    def bytes_generator(self) -> Generator[bytes]:
+        if self.args.txt_file:
+            all_bytes = (v.encode() for v in self.args.txt_file)
+        elif self.args.image_zip_file:
+            zipfile_ = zipfile.ZipFile(self.args.image_zip_file)
+            all_bytes = (zipfile_.open(v).read() for v in zipfile_.namelist())
+        elif self.args.video_zip_file:
+            zipfile_ = zipfile.ZipFile(self.args.video_zip_file)
+            all_bytes = (zipfile_.open(v).read() for v in zipfile_.namelist())
+        else:
+            raise AttributeError('--txt_file, --image_zip_file, --video_zip_file one must be given')
+
+        return all_bytes
+
 
 class ProgressBar:
-    def __init__(self, all_bytes: List[bytes], batch_size: int, bar_len: int = 20, task_name: str = ''):
-        self.all_bytes_len = [len(v) for v in all_bytes]
-        self.batch_size = batch_size
-        self.total_batch = ceil(len(self.all_bytes_len) / self.batch_size)
+    def __init__(self, bar_len: int = 20, task_name: str = ''):
         self.bar_len = bar_len
         self.task_name = task_name
 
     def update(self):
-        if self.num_batch > self.total_batch - 1:
-            return
         sys.stdout.write('\r')
         elapsed = time.perf_counter() - self.start_time
         elapsed_str = colored('elapsed', 'yellow')
         speed_str = colored('speed', 'yellow')
-        estleft_str = colored('left', 'yellow')
-        self.num_batch += 1
-        percent = self.num_batch / self.total_batch
-        num_bytes = sum(self.all_bytes_len[((self.num_batch - 1) * self.batch_size):(self.num_batch * self.batch_size)])
+        self.num_bars += 1
+        if self.num_bars > self.bar_len:
+            self.num_bars -= self.bar_len
+            sys.stdout.write('\n')
         sys.stdout.write(
-            '{:>10} [{:<{}}] {:3.0f}%   {:>8}: {:3.1f}s   {:>8}: {:3.1f} bytes/s  {:3.1f} batch/s {:>8}: {:3.1f}s'.format(
+            '{:>10} [{:<{}}] {:3.0f}%   {:>8}: {:3.1f}s   {:>8}: {:3.1f} batch/s'.format(
                 colored(self.task_name, 'cyan'),
-                colored('=' * int(self.bar_len * percent), 'green'),
+                colored('=' * self.num_bars, 'green'),
                 self.bar_len + 9,
-                percent * 100,
                 elapsed_str,
                 elapsed,
                 speed_str,
-                num_bytes / elapsed,
-                self.num_batch / elapsed,
-                estleft_str,
-                (self.total_batch - self.num_batch) / ((self.num_batch + 0.0001) / elapsed)
+                self.num_bars / elapsed,
             ))
         sys.stdout.flush()
 
     def __enter__(self):
         self.start_time = time.perf_counter()
-        self.num_batch = -1
+        self.num_bars = -1
         sys.stdout.write('\n')
         self.update()
         return self
diff --git a/gnes/proto/__init__.py b/gnes/proto/__init__.py
index 9b4eff20..9e87ddb5 100644
--- a/gnes/proto/__init__.py
+++ b/gnes/proto/__init__.py
@@ -15,7 +15,7 @@
 
 import ctypes
 import random
-from typing import List
+from typing import List, Iterator
 from typing import Optional
 
 import numpy as np
@@ -30,7 +30,7 @@
 
 class RequestGenerator:
     @staticmethod
-    def index(data: List[bytes], batch_size: int = 0, doc_type: int = gnes_pb2.Document.TEXT,
+    def index(data: Iterator[bytes], batch_size: int = 0, doc_type: int = gnes_pb2.Document.TEXT,
               doc_id_start: int = 0, request_id_start: int = 0,
               random_doc_id: bool = False,
               *args, **kwargs):
@@ -49,7 +49,7 @@ def index(data: List[bytes], batch_size: int = 0, doc_type: int = gnes_pb2.Docum
             request_id_start += 1
 
     @staticmethod
-    def train(data: List[bytes], batch_size: int = 0, doc_type: int = gnes_pb2.Document.TEXT,
+    def train(data: Iterator[bytes], batch_size: int = 0, doc_type: int = gnes_pb2.Document.TEXT,
               doc_id_start: int = 0, request_id_start: int = 0,
               random_doc_id: bool = False,
               *args, **kwargs):