diff --git a/lang/zh/gklearn/ged/util/misc.py b/lang/zh/gklearn/ged/util/misc.py
new file mode 100644
index 0000000..457d276
--- /dev/null
+++ b/lang/zh/gklearn/ged/util/misc.py
@@ -0,0 +1,129 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Thu Mar 19 18:13:56 2020
+
+@author: ljia
+"""
+from gklearn.utils import dummy_node
+
+
+def construct_node_map_from_solver(solver, node_map, solution_id):
+	node_map.clear()
+	num_nodes_g = node_map.num_source_nodes()
+	num_nodes_h = node_map.num_target_nodes()
+	
+	# add deletions and substitutions
+	for row in range(0, num_nodes_g):
+		col = solver.get_assigned_col(row, solution_id)
+		if col >= num_nodes_h:
+			node_map.add_assignment(row, dummy_node())
+		else:
+			node_map.add_assignment(row, col)
+			
+	# insertions.
+	for col in range(0, num_nodes_h):
+		if solver.get_assigned_row(col, solution_id) >= num_nodes_g:
+			node_map.add_assignment(dummy_node(), col)
+	
+
+def options_string_to_options_map(options_string):
+    """Transforms an options string into an options map.
+    
+    Parameters
+    ----------
+    options_string : string
+        Options string of the form "[--<option> <arg>] [...]".
+    
+    Return
+    ------
+    options_map : dict{string : string}
+        Map with one key-value pair (<option>, <arg>) for each option contained in the string.
+    """
+    if options_string == '':
+        return
+    options_map = {}
+    words = []
+    tokenize(options_string, ' ', words)
+    expect_option_name = True
+    for word in words:
+        if expect_option_name:
+            is_opt_name, word = is_option_name(word)
+            if is_opt_name:
+                option_name = word
+                if option_name in options_map:
+                    raise Exception('Multiple specification of option "' + option_name + '".')
+                options_map[option_name] = ''
+            else:
+                raise Exception('Invalid options "' + options_string + '". Usage: options = "[--<option> <arg>] [...]"')
+        else:
+            is_opt_name, word = is_option_name(word)
+            if is_opt_name:
+                raise Exception('Invalid options "' + options_string + '". Usage: options = "[--<option> <arg>] [...]"')
+            else:
+                options_map[option_name] = word
+        expect_option_name = not expect_option_name
+    return options_map
+    
+
+def tokenize(sentence, sep, words):
+    """Separates a sentence into words separated by sep (unless contained in single quotes).
+    
+    Parameters
+    ----------
+    sentence : string
+        The sentence that should be tokenized.
+        
+    sep : string 
+        The separator. Must be different from "'".
+        
+    words : list[string]
+        The obtained words.
+    """
+    outside_quotes = True
+    word_length = 0
+    pos_word_start = 0
+    for pos in range(0, len(sentence)):
+        if sentence[pos] == '\'':
+            if not outside_quotes and pos < len(sentence) - 1:
+                if sentence[pos + 1] != sep:
+                    raise Exception('Sentence contains closing single quote which is followed by a char different from ' + sep + '.')
+            word_length += 1
+            outside_quotes = not outside_quotes
+        elif outside_quotes and sentence[pos] == sep:
+            if word_length > 0:
+                words.append(sentence[pos_word_start:pos_word_start + word_length])
+            pos_word_start = pos + 1
+            word_length = 0
+        else:
+            word_length += 1
+    if not outside_quotes:
+        raise Exception('Sentence contains unbalanced single quotes.')
+    if word_length > 0:
+        words.append(sentence[pos_word_start:pos_word_start + word_length])
+
+
+def is_option_name(word):
+    """Checks whether a word is an option name and, if so, removes the leading dashes.
+    
+    Parameters
+    ----------
+    word : string
+        Word.
+        
+    return
+    ------
+    True if word is of the form "--<option>".
+    
+    word : string
+        The word without the leading dashes.
+    """
+    if word[0] == '\'':
+        word = word[1:len(word) - 2]
+        return False, word
+    if len(word) < 3:
+        return False, word
+    if word[0] == '-' and word[1] == '-' and word[2] != '-':
+        word = word[2:]
+        return True, word
+    return False, word
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