Python test_ranking_function Examples

Example #1

# Now if you call rank on a vector it will output a ranking score.  In
# particular, the ranking score for relevant vectors should be larger than the
# score for non-relevant vectors.
print "ranking score for a relevant vector:     ", rank(data.relevant[0])
print "ranking score for a non-relevant vector: ", rank(data.nonrelevant[0])
# The output is the following:
#    ranking score for a relevant vector:     0.5
#    ranking score for a non-relevant vector: -0.5

# If we want an overall measure of ranking accuracy we can compute the ordering
# accuracy and mean average precision values by calling test_ranking_function().
# In this case, the ordering accuracy tells us how often a non-relevant vector
# was ranked ahead of a relevant vector.  In this case, it returns 1 for both
# metrics, indicating that the rank function outputs a perfect ranking.
print dlib.test_ranking_function(rank, data)

# The ranking scores are computed by taking the dot product between a learned
# weight vector and a data vector.  If you want to see the learned weight vector
# you can display it like so:
print "weights: \n", rank.weights
# In this case the weights are:
#  0.5
# -0.5

# In the above example, our data contains just two sets of objects.  The
# relevant set and non-relevant set.  The trainer is attempting to find a
# ranking function that gives every relevant vector a higher score than every
# non-relevant vector.  Sometimes what you want to do is a little more complex
# than this.
#

Example #2

# particular, the ranking score for relevant vectors should be larger than the
# score for non-relevant vectors.
print(("Ranking score for a relevant vector:     {}".format(
    rank(data.relevant[0]))))
print(("Ranking score for a non-relevant vector: {}".format(
    rank(data.nonrelevant[0]))))
# The output is the following:
#    ranking score for a relevant vector:     0.5
#    ranking score for a non-relevant vector: -0.5

# If we want an overall measure of ranking accuracy we can compute the ordering
# accuracy and mean average precision values by calling test_ranking_function().
# In this case, the ordering accuracy tells us how often a non-relevant vector
# was ranked ahead of a relevant vector.  In this case, it returns 1 for both
# metrics, indicating that the rank function outputs a perfect ranking.
print((dlib.test_ranking_function(rank, data)))

# The ranking scores are computed by taking the dot product between a learned
# weight vector and a data vector.  If you want to see the learned weight vector
# you can display it like so:
print(("Weights: {}".format(rank.weights)))
# In this case the weights are:
#  0.5
# -0.5

# In the above example, our data contains just two sets of objects.  The
# relevant set and non-relevant set.  The trainer is attempting to find a
# ranking function that gives every relevant vector a higher score than every
# non-relevant vector.  Sometimes what you want to do is a little more complex
# than this.
#

Example #3

File: svm_rank.py Project: 20337112/dlib

# score for non-relevant vectors.  
print("Ranking score for a relevant vector:     {}".format(
    rank(data.relevant[0])))
print("Ranking score for a non-relevant vector: {}".format(
    rank(data.nonrelevant[0])))
# The output is the following:
#    ranking score for a relevant vector:     0.5
#    ranking score for a non-relevant vector: -0.5


# If we want an overall measure of ranking accuracy we can compute the ordering
# accuracy and mean average precision values by calling test_ranking_function().
# In this case, the ordering accuracy tells us how often a non-relevant vector
# was ranked ahead of a relevant vector.  In this case, it returns 1 for both
# metrics, indicating that the rank function outputs a perfect ranking.
print(dlib.test_ranking_function(rank, data))

# The ranking scores are computed by taking the dot product between a learned
# weight vector and a data vector.  If you want to see the learned weight vector
# you can display it like so:
print("Weights: {}".format(rank.weights))
# In this case the weights are:
#  0.5 
# -0.5 

# In the above example, our data contains just two sets of objects.  The
# relevant set and non-relevant set.  The trainer is attempting to find a
# ranking function that gives every relevant vector a higher score than every
# non-relevant vector.  Sometimes what you want to do is a little more complex
# than this. 
#

Example #4

File: sampletest.py Project: hvhvhh/tomtatvanban

# Now if you call rank on a vector it will output a ranking score.  In
# particular, the ranking score for relevant vectors should be larger than the
# score for non-relevant vectors.  
print ("ranking score for a relevant vector:     ", rank(data.relevant[0]))
print ("ranking score for a non-relevant vector: ", rank(data.nonrelevant[0]))
# The output is the following:
#    ranking score for a relevant vector:     0.5
#    ranking score for a non-relevant vector: -0.5


# If we want an overall measure of ranking accuracy we can compute the ordering
# accuracy and mean average precision values by calling test_ranking_function().
# In this case, the ordering accuracy tells us how often a non-relevant vector
# was ranked ahead of a relevant vector.  In this case, it returns 1 for both
# metrics, indicating that the rank function outputs a perfect ranking.
print ("test: ", dlib.test_ranking_function(rank, data))

# The ranking scores are computed by taking the dot product between a learned
# weight vector and a data vector.  If you want to see the learned weight vector
# you can display it like so:
print ("weights: \n", rank.weights)
# In this case the weights are:
#  0.5 
# -0.5 




# In the above example, our data contains just two sets of objects.  The
# relevant set and non-relevant set.  The trainer is attempting to find a
# ranking function that gives every relevant vector a higher score than every