Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Image recognition of handwritten digits in MNIS...
Search
Dimitris Spathis
January 17, 2016
Research
0
410
Image recognition of handwritten digits in MNIST and flower classification in IRIS dataset
Code available here
https://github.com/sdimi/handwritten-digits-recognition
Dimitris Spathis
January 17, 2016
Tweet
Share
More Decks by Dimitris Spathis
See All by Dimitris Spathis
Song analysis "Jueves - La Oreja de Van Gogh "
sdimi
0
730
Wikipedia graph network analysis
sdimi
0
160
Character level LSTM Recurrent Neural Networks for language and music modeling
sdimi
0
310
Topic modeling and summarization of live TV shows via Twitter
sdimi
0
150
Diagnosing respiratory diseases with machine learning
sdimi
0
170
Detecting Irony on Greek Political Tweets: A Text Mining Approach
sdimi
0
120
Greece Unknown Facts
sdimi
1
190
Glocal News - Discover Top Local News, Globally.
sdimi
0
200
Responsive Web - Mobile First. An overview.
sdimi
1
190
Other Decks in Research
See All in Research
Ankylosing Spondylitis
ankh2054
0
150
一般道の交通量減少と速度低下についての全国分析と熊本市におけるケーススタディ(20251122 土木計画学研究発表会)
trafficbrain
0
180
AI Agentの精度改善に見るML開発との共通点 / commonalities in accuracy improvements in agentic era
shimacos
6
1.4k
Tiaccoon: Unified Access Control with Multiple Transports in Container Networks
hiroyaonoe
0
1.2k
Dwangoでの漫画データ活用〜漫画理解と動画作成〜@コミック工学シンポジウム2025
kzmssk
0
160
svc-hook: hooking system calls on ARM64 by binary rewriting
retrage
2
170
討議:RACDA設立30周年記念都市交通フォーラム2026
trafficbrain
0
610
ForestCast: Forecasting Deforestation Risk at Scale with Deep Learning
satai
3
540
その推薦システムの評価指標、ユーザーの感覚とズレてるかも
kuri8ive
1
350
FUSE-RSVLM: Feature Fusion Vision-Language Model for Remote Sensing
satai
3
240
病院向け生成AIプロダクト開発の実践と課題
hagino3000
0
580
ローテーション別のサイドアウト戦略 ~なぜあのローテは回らないのか?~
vball_panda
0
300
Featured
See All Featured
Fashionably flexible responsive web design (full day workshop)
malarkey
408
66k
The AI Search Optimization Roadmap by Aleyda Solis
aleyda
1
5.4k
What does AI have to do with Human Rights?
axbom
PRO
1
2k
Visual Storytelling: How to be a Superhuman Communicator
reverentgeek
2
470
Dominate Local Search Results - an insider guide to GBP, reviews, and Local SEO
greggifford
PRO
0
110
世界の人気アプリ100個を分析して見えたペイウォール設計の心得
akihiro_kokubo
PRO
67
37k
30 Presentation Tips
portentint
PRO
1
250
Build your cross-platform service in a week with App Engine
jlugia
234
18k
WENDY [Excerpt]
tessaabrams
9
36k
Redefining SEO in the New Era of Traffic Generation
szymonslowik
1
250
Digital Projects Gone Horribly Wrong (And the UX Pros Who Still Save the Day) - Dean Schuster
uxyall
0
760
Refactoring Trust on Your Teams (GOTO; Chicago 2020)
rmw
35
3.4k
Transcript
Αναγνώριση χειρόγραφων χαρακτήρων στο MNIST dataset & φυτών στο IRIS
dataset με μεθόδους μηχανικής μάθησης Δημήτρης Σπαθής Εξαμηνιαία εργασία – Ιαν 2016 Υπολογιστική Νοημοσύνη – Στατιστική Μάθηση Καθ.: Αναστάσιος Τέφας
MNIST dataset 70.000 εικόνες 28 x 28 pixel 784 διαστάσεις
60.000 train 10.000 test {0,1,2,..9} multi-class
Εργαλεία Python python.org Scikit – learn scikit-learn.org Matplotlib matplotlib.org Numpy
numpy.org
Προεπεξεργασία δεδομένων Ανακάτεμα δειγμάτων X, y = shuffle(mnist.data, mnist.target) Κανονικοποίηση
pixels [0,1] X_train, y_train = np.float32(X[:60000])/ 255., np.float32(y[:60000])
Κρατάμε 90 components 90,3% της αρχικής πληροφορίας PCA – Μείωση
Διάστασης (784 → 90)
Εκπαίδευση SVM fitting classifier = svm.SVC(gamma=0.01, C=3, kernel='rbf') 5 Cross
validation cross_validation.cross_val_score(classifier, X_train, y_train, cv=5)
Αποτελέσματα εκπαίδευσης
Παραδείγματα ταξινόμησης
Μείωση Διάστασης Kernel PCA (784 → 300) kpca = KernelPCA(kernel="rbf",n_components=300
, gamma=1) LDA (300 → 9) lda = LDA() #should keep [classes – 1] components
Nearest Classifier K Nearest Neighbor clf = neighbors.KNeighborsClassifier(n_neighbors=5) Nearest Centroid
classifier = NearestCentroid(metric='euclidean', shrink_threshold=None)
Αποτελέσματα εκπαίδευσης
Embedding για Μείωση Διάστασης (784 → 2) Spectral Embedding manifold.SpectralEmbedding
(n_components=2, affinity='nearest_neighbors', gamma=None, random_state=None, eigen_solver=None, n_neighbors=5) Isomap Embedding manifold.Isomap(n_neighbors=5, n_components=2)
Spectral Clustering Kρατάμε 5000 δείγματα για οπτικοποίηση Spectral Clustering cluster.SpectralClustering(n_clusters=10,
eigen_solver='arpack', affinity="nearest_neighbors")
None
None
Αποτελέσματα clustering
IRIS dataset 150 λουλούδια 4 διαστάσεις sepal length sepal width
petal length petal width 3 κλάσεις Iris Setosa Iris Versicolour Iris Virginica
Αποτελέσματα SVM εκπαίδευσης
SVM fine-tuning C
SVM fine-tuning Degree
SVM fine-tuning Gamma
Μείωση Διάστασης
None
Αποτελέσματα clustering & embedding
None
None
Further work Kernel PCA – Memory Errors Incremental PCA Grid
Search Deep Architectures Distributed / Parallel MapReduce / Spark Κώδικας σύντομα στο github.com/sdimi