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diff --git a/util/visualizer.py b/util/visualizer.py
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+import numpy as np
+import os
+import ntpath
+import time
+from . import util
+from . import html
+from pdb import set_trace as st
+
+class Visualizer():
+    def __init__(self, opt):
+        # self.opt = opt
+        self.display_id = opt.display_id
+        if self.display_id > 0:
+            from . import display
+            self.display = display
+        else:
+            from . import html
+            self.web_dir = os.path.join(opt.checkpoints_dir, opt.name, 'web')
+            self.img_dir = os.path.join(self.web_dir, 'images')
+            self.name = opt.name
+            self.win_size = opt.display_winsize
+            print('create web directory %s...' % self.web_dir)
+            util.mkdirs([self.web_dir, self.img_dir])
+
+
+    # |visuals|: dictionary of images to display or save
+    def display_current_results(self, visuals, epoch):
+        if self.display_id > 0: # show images in the browser
+            idx = 0
+            for label, image_numpy in visuals:
+                image_numpy = np.flipud(image_numpy)
+                self.display.image(image_numpy, title=label,
+                                   win=self.display_id + idx)
+                idx += 1
+        else:  # save images to a web directory
+            for label, image_numpy in visuals.items():
+                img_path = os.path.join(self.img_dir, 'epoch%.3d_%s.png' % (epoch, label))
+                util.save_image(image_numpy, img_path)
+            # update website
+            webpage = html.HTML(self.web_dir, 'Experiment name = %s' % self.name, reflesh=1)
+            for n in range(epoch, 0, -1):
+                webpage.add_header('epoch [%d]' % n)
+                ims = []
+                txts = []
+                links = []
+
+                for label, image_numpy in visuals.items():
+                    img_path = 'epoch%.3d_%s.png' % (n, label)
+                    ims.append(img_path)
+                    txts.append(label)
+                    links.append(img_path)
+                webpage.add_images(ims, txts, links, width=self.win_size)
+            webpage.save()
+            # st()
+    # errors: dictionary of error labels and values
+    def plot_current_errors(self, epoch, i, opt, errors):
+        pass
+
+    # errors: same format as |errors| of plotCurrentErrors
+    def print_current_errors(self, epoch, i, errors, start_time):
+        message = '(epoch: %d, iters: %d, time: %.3f) ' % (epoch, i, time.time() - start_time)
+        for k, v in errors.items():
+            message += '%s: %.3f ' % (k, v)
+
+        print(message)
+
+    # save image to the disk
+    def save_images(self, webpage, visuals, image_path):
+        image_dir = webpage.get_image_dir()
+        short_path = ntpath.basename(image_path[0])
+        name = os.path.splitext(short_path)[0]
+
+        webpage.add_header(name)
+        ims = []
+        txts = []
+        links = []
+
+        for label, image_numpy in visuals.items():
+            image_name = '%s_%s.png' % (name, label)
+            save_path = os.path.join(image_dir, image_name)
+            util.save_image(image_numpy, save_path)
+
+            ims.append(image_name)
+            txts.append(label)
+            links.append(image_name)
+        webpage.add_images(ims, txts, links, width=self.win_size)