diff --git a/exps/LFNA/vis-synthetic.py b/exps/LFNA/vis-synthetic.py
index 7eefc0a..23a3f85 100644
--- a/exps/LFNA/vis-synthetic.py
+++ b/exps/LFNA/vis-synthetic.py
@@ -24,10 +24,7 @@ if str(lib_dir) not in sys.path:
     sys.path.insert(0, str(lib_dir))
 
 
-from datasets import ConstantGenerator, SinGenerator, SyntheticDEnv
-from datasets import DynamicQuadraticFunc
 from datasets.synthetic_example import create_example_v1
-
 from utils.temp_sync import optimize_fn, evaluate_fn
 
 
@@ -61,43 +58,72 @@ def draw_multi_fig(save_dir, timestamp, scatter_list, wh, fig_title=None):
             tick.label.set_rotation(10)
         for tick in cur_ax.yaxis.get_major_ticks():
             tick.label.set_fontsize(LabelSize - font_gap)
-        plt.legend(loc=1, fontsize=LegendFontsize)
+        cur_ax.legend(loc=1, fontsize=LegendFontsize)
     fig.savefig(str(save_path) + ".pdf", dpi=dpi, bbox_inches="tight", format="pdf")
     fig.savefig(str(save_path) + ".png", dpi=dpi, bbox_inches="tight", format="png")
     plt.close("all")
 
 
+def find_min(cur, others):
+    if cur is None:
+        return float(others.min())
+    else:
+        return float(min(cur, others.min()))
+
+
+def find_max(cur, others):
+    if cur is None:
+        return float(others.max())
+    else:
+        return float(max(cur, others.max()))
+
+
 def compare_cl(save_dir):
     save_dir = Path(str(save_dir))
     save_dir.mkdir(parents=True, exist_ok=True)
-    dynamic_env, function = create_example_v1(100, num_per_task=1000)
+    dynamic_env, function = create_example_v1(
+        timestamp_config=dict(num=200, min_timestamp=-1, max_timestamp=1.0),
+        num_per_task=1000,
+    )
 
-    additional_xaxis = np.arange(-6, 6, 0.2)
     models = dict()
 
     cl_function = copy.deepcopy(function)
     cl_function.set_timestamp(0)
-    cl_xaxis_all = None
+    cl_xaxis_min = None
+    cl_xaxis_max = None
+
+    all_data = OrderedDict()
 
     for idx, (timestamp, dataset) in enumerate(tqdm(dynamic_env, ncols=50)):
         xaxis_all = dataset[:, 0].numpy()
-        # xaxis_all = np.concatenate((additional_xaxis, xaxis_all))
-        # compute the ground truth
+        current_data = dict()
+
         function.set_timestamp(timestamp)
         yaxis_all = function.noise_call(xaxis_all)
+        current_data["lfna_xaxis_all"] = xaxis_all
+        current_data["lfna_yaxis_all"] = yaxis_all
 
-        # create CL data
-        if cl_xaxis_all is None:
-            cl_xaxis_all = xaxis_all
-        else:
-            cl_xaxis_all = np.concatenate((cl_xaxis_all, xaxis_all + timestamp * 0.2))
-        cl_yaxis_all = cl_function(cl_xaxis_all)
+        import pdb
 
+        pdb.set_trace()
+
+        # compute cl-min
+        cl_xaxis_min = find_min(cl_xaxis_min, xaxis_all)
+        cl_xaxis_max = find_max(cl_xaxis_max, xaxis_all) + idx * 0.1
+        cl_xaxis_all = np.arange(cl_xaxis_min, cl_xaxis_max, step=0.05)
+
+        cl_yaxis_all = cl_function.noise_call(cl_xaxis_all)
+        current_data["cl_xaxis_all"] = cl_xaxis_all
+        current_data["cl_yaxis_all"] = cl_yaxis_all
+        all_data[timestamp] = current_data
+
+    for idx, (timestamp, xdata) in enumerate(tqdm(all_data.items(), ncols=50)):
         scatter_list = []
         scatter_list.append(
             {
-                "xaxis": xaxis_all,
-                "yaxis": yaxis_all,
+                "xaxis": xdata["lfna_xaxis_all"],
+                "yaxis": xdata["lfna_yaxis_all"],
                 "color": "k",
                 "s": 10,
                 "alpha": 0.99,
@@ -107,6 +133,9 @@ def compare_cl(save_dir):
             }
         )
 
+        cl_xaxis_all = current_data["cl_xaxis_all"]
+        cl_yaxis_all = current_data["cl_yaxis_all"]
+
         scatter_list.append(
             {
                 "xaxis": cl_xaxis_all,
@@ -121,15 +150,21 @@ def compare_cl(save_dir):
         )
 
         draw_multi_fig(
-            save_dir, timestamp, scatter_list,
-            wh=(2000, 1300), fig_title="Timestamp={:03d}".format(timestamp)
+            save_dir,
+            timestamp,
+            scatter_list,
+            wh=(2000, 1300),
+            fig_title="Timestamp={:03d}".format(timestamp),
         )
     print("Save all figures into {:}".format(save_dir))
     save_dir = save_dir.resolve()
-    cmd = "ffmpeg -y -i {xdir}/%04d.png -pix_fmt yuv420p -vf fps=2 -vf scale=2000:1300 -vb 5000k {xdir}/vis.mp4".format(
-        xdir=save_dir
+    base_cmd = (
+        "ffmpeg -y -i {xdir}/%04d.png -vf fps=2 -vf scale=2000:1300 -vb 5000k".format(
+            xdir=save_dir
+        )
     )
-    os.system(cmd)
+    os.system("{:} -pix_fmt yuv420p {xdir}/vis.mp4".format(base_cmd, xdir=save_dir))
+    os.system("{:} -c:a libvorbis {xdir}/vis.webm".format(base_cmd, xdir=save_dir))
 
 
 if __name__ == "__main__":
diff --git a/lib/datasets/synthetic_env.py b/lib/datasets/synthetic_env.py
index 9d64f3b..f4193bc 100644
--- a/lib/datasets/synthetic_env.py
+++ b/lib/datasets/synthetic_env.py
@@ -19,7 +19,7 @@ class SyntheticDEnv(data.Dataset):
         mean_functors: List[data.Dataset],
         cov_functors: List[List[data.Dataset]],
         num_per_task: int = 5000,
-        time_stamp_config: Optional[Dict] = None,
+        timestamp_config: Optional[Dict] = None,
         mode: Optional[str] = None,
     ):
         self._ndim = len(mean_functors)
@@ -31,12 +31,12 @@ class SyntheticDEnv(data.Dataset):
                 cov_functor
             ), "length does not match {:} vs. {:}".format(self._ndim, len(cov_functor))
         self._num_per_task = num_per_task
-        if time_stamp_config is None:
-            time_stamp_config = dict(mode=mode)
+        if timestamp_config is None:
+            timestamp_config = dict(mode=mode)
         else:
-            time_stamp_config["mode"] = mode
+            timestamp_config["mode"] = mode
 
-        self._timestamp_generator = TimeStamp(**time_stamp_config)
+        self._timestamp_generator = TimeStamp(**timestamp_config)
 
         self._mean_functors = mean_functors
         self._cov_functors = cov_functors
diff --git a/lib/datasets/synthetic_example.py b/lib/datasets/synthetic_example.py
index 0fd780c..ffe7e67 100644
--- a/lib/datasets/synthetic_example.py
+++ b/lib/datasets/synthetic_example.py
@@ -2,21 +2,23 @@
 # Copyright (c) Xuanyi Dong [GitHub D-X-Y], 2021.04 #
 #####################################################
 
-from .math_base_funcs import DynamicQuadraticFunc
+from .math_adv_funcs import DynamicQuadraticFunc
 from .math_adv_funcs import ConstantFunc, ComposedSinFunc
 from .synthetic_env import SyntheticDEnv
 
 
-def create_example_v1(timestamps=50, num_per_task=5000):
+def create_example_v1(
+    timestamp_config=dict(num=100, min_timestamp=0.0, max_timestamp=1.0),
+    num_per_task=5000,
+):
     mean_generator = ComposedSinFunc()
     std_generator = ComposedSinFunc(min_amplitude=0.5, max_amplitude=0.5)
-    std_generator.set_transform(lambda x: x + 1)
 
     dynamic_env = SyntheticDEnv(
         [mean_generator],
         [[std_generator]],
         num_per_task=num_per_task,
-        time_stamp_config=dict(num=timestamps),
+        timestamp_config=timestamp_config,
     )
 
     function = DynamicQuadraticFunc()
diff --git a/scripts/black.sh b/scripts/black.sh
new file mode 100644
index 0000000..10c55fc
--- /dev/null
+++ b/scripts/black.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+# bash ./scripts/black.sh
+
+black ./tests/
+black ./lib/datasets
+black ./lib/xlayers
+black ./exps/LFNA
+black ./exps/trading