Tuned default chunksize for keyword break

[cipher-tools.git] / norms.py

diff --git a/norms.py b/norms.py
index 744cbe4d9d4336f574d7b0885fed973189acd7d9..08cff74b82541f2e2331f2ce85775db68ea44399 100644 (file)
--- a/norms.py
+++ b/norms.py
@@ -96,6 +96,55 @@ def l3(frequencies1, frequencies2):
         total += abs(frequencies1[k] - frequencies2[k]) ** 3
     return total ** (1/3)
 
+def geometric_mean(frequencies1, frequencies2):
+    """Finds the geometric mean of the absolute differences between two frequency profiles, 
+    expressed as dictionaries.
+    Assumes every key in frequencies1 is also in frequencies2
+    
+    >>> geometric_mean({'a':2, 'b':2, 'c':2}, {'a':1, 'b':1, 'c':1})
+    1
+    >>> geometric_mean({'a':2, 'b':2, 'c':2}, {'a':1, 'b':1, 'c':1})
+    1
+    >>> geometric_mean({'a':2, 'b':2, 'c':2}, {'a':1, 'b':5, 'c':1})
+    3
+    >>> geometric_mean(normalise({'a':2, 'b':2, 'c':2}), normalise({'a':1, 'b':5, 'c':1}))
+    0.057022248808851934
+    >>> geometric_mean(normalise({'a':2, 'b':2, 'c':2}), normalise({'a':1, 'b':1, 'c':1}))
+    0.0
+    >>> geometric_mean(normalise({'a':2, 'b':2, 'c':2}), normalise({'a':1, 'b':1, 'c':0}))
+    0.009720703533656434
+    """
+    total = 1
+    for k in frequencies1.keys():
+        total *= abs(frequencies1[k] - frequencies2[k])
+    return total
+
+def harmonic_mean(frequencies1, frequencies2):
+    """Finds the harmonic mean of the absolute differences between two frequency profiles, 
+    expressed as dictionaries.
+    Assumes every key in frequencies1 is also in frequencies2
+
+    >>> harmonic_mean({'a':2, 'b':2, 'c':2}, {'a':1, 'b':1, 'c':1})
+    1.0
+    >>> harmonic_mean({'a':2, 'b':2, 'c':2}, {'a':1, 'b':1, 'c':1})
+    1.0
+    >>> harmonic_mean({'a':2, 'b':2, 'c':2}, {'a':1, 'b':5, 'c':1})
+    1.2857142857142858
+    >>> harmonic_mean(normalise({'a':2, 'b':2, 'c':2}), normalise({'a':1, 'b':5, 'c':1}))
+    0.3849001794597505
+    >>> harmonic_mean(normalise({'a':2, 'b':2, 'c':2}), normalise({'a':1, 'b':1, 'c':1}))
+    0
+    >>> harmonic_mean(normalise({'a':2, 'b':2, 'c':2}), normalise({'a':1, 'b':1, 'c':0}))
+    0.17497266360581604
+    """
+    total = 0
+    for k in frequencies1.keys():
+        if abs(frequencies1[k] - frequencies2[k]) == 0:
+            return 0
+        total += 1 / abs(frequencies1[k] - frequencies2[k])
+    return len(frequencies1) / total
+
+
 def cosine_distance(frequencies1, frequencies2):
     """Finds the distances between two frequency profiles, expressed as dictionaries.
     Assumes every key in frequencies1 is also in frequencies2