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authornunzip <np_scarh@e4-pattern-vm.europe-west4-a.c.electric-orbit-223819.internal>2018-12-08 18:38:53 +0000
committernunzip <np_scarh@e4-pattern-vm.europe-west4-a.c.electric-orbit-223819.internal>2018-12-08 18:38:53 +0000
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tree2ae6eafc131b9e40a04846bce46740eea627a1b5
parent5bf005f123a3ba9c90544654cea38b98603adb9a (diff)
parentaaee9b10aab7c78c7a02d5caec4ed37b85dff1bd (diff)
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Merge branch 'master' of skozl.com:e4-pattern
-rwxr-xr-xevaluate.py3
-rw-r--r--report2/fig/baseline.pdfbin0 -> 11539 bytes
-rw-r--r--report2/fig/eucranklist.pngbin0 -> 3880590 bytes
-rwxr-xr-xreport2/paper.md51
4 files changed, 50 insertions, 4 deletions
diff --git a/evaluate.py b/evaluate.py
index ebfc34e..7ce586b 100755
--- a/evaluate.py
+++ b/evaluate.py
@@ -86,7 +86,8 @@ def test_model(gallery_data, probe_data, gallery_label, probe_label, gallery_cam
else:
if args.mahalanobis:
# metric = 'jaccard' is also valid
- distances = cdist(probe_data, gallery_data, 'jaccard')
+ cov_inv = np.linalg.inv(np.cov(gallery_data.T)).T
+ distances = cdist(probe_data, gallery_data, 'mahalanobis', VI=cov_inv)
else:
distances = cdist(probe_data, gallery_data, 'euclidean')
diff --git a/report2/fig/baseline.pdf b/report2/fig/baseline.pdf
new file mode 100644
index 0000000..e6a4794
--- /dev/null
+++ b/report2/fig/baseline.pdf
Binary files differ
diff --git a/report2/fig/eucranklist.png b/report2/fig/eucranklist.png
new file mode 100644
index 0000000..9daaa9c
--- /dev/null
+++ b/report2/fig/eucranklist.png
Binary files differ
diff --git a/report2/paper.md b/report2/paper.md
index f70f77a..14f2f98 100755
--- a/report2/paper.md
+++ b/report2/paper.md
@@ -1,12 +1,57 @@
# Summary
+In this report we analysed how distance metrics learning affects classification
+accuracy for the dataset CUHK03. The baseline method used for classification is
+Nearest Neighbors based on Euclidean distance. The improved approach we propose
+mixes Jaccardian and Mahalanobis metrics to obtain a ranklist that takes into
+account also the reciprocal neighbors. This approach is computationally more
+complex, since the matrices representing distances are effectively calculated
+twice. However it is possible to observe a significant accuracy improvement of
+around 10% for the $@rank1$ case. Accuracy improves overall, especially for
+$@rankn$ cases with low n.
+
+# Formulation of the Addresssed Machine Learning Problem
+
+## CUHK03
+
+The dataset CUHK03 contains 14096 pictures of people captured from two
+different cameras. The feature vectors used come from passing the
+rescaled images through ResNet50. Each feature vector contains 2048
+features that we use for classification. The pictures represent 1467 different
+people and each of them appears between 9 and 10 times. The separation of
+train_idx, query_idx and gallery_idx allows to perform taining and validation
+on a training set (train_idx, adequately split between test, train and
+validation keeping the same number of identities). This prevents overfitting
+the algorithm to the specific data associated with query_idx and gallery_idx.
+
+## Probelm to solve
+
+The problem to solve is to create a ranklist for each image of the query set
+by finding the nearest neighbor(s) within a gallery set. However gallery images
+with the same label and taken from the same camera as the query image should
+not be considered when forming the ranklist.
+
+## Nearest Neighbor ranklist
+
+Nearest Neighbor aims to find the gallery image whose feature are the closest to
+the ones of a query image, predicting the class of the query image as the same
+of its nearest neighbor(s). The distance between images can be calculated through
+different distance metrics, however one of the most commonly used is euclidean
+distance, represented as $d=\sqrt{\sum (x-y)^{2}}$.
+
+EXPLAIN KNN BRIEFLY
-# Baseline Formulation
# Baseline Evaluation
-# Formulation of Suggested Improvement
+\begin{figure}
+\begin{center}
+\includegraphics[width=17em]{fig/baseline.pdf}
+\caption{Recognition accuracy of baseline Nearest Neighbor @rank k}
+\label{fig:baselineacc}
+\end{center}
+\end{figure}
-# Suggested Improvement Evaluation
+# Suggested Improvement
# Conclusion