EWALDIS

An algorithm for mining discriminative patterns in dynamic graphs. Accompanying paper was submitted to Discovery Science (DS) 2018 conference.

Building EWALDIS (in the project directory) in Linux

• Requires cmake of version >= 3.9 and c++17 compiler

cmake .
make

Running the experiments for DS 2018 paper

• Results will be written into results/* directories

./ewaldis -v --vertices data/dblp1/dblp_vertices.csv --edges data/dblp1/dblp_edges.csv --train_pos data/dblp1/dblp_train_positive_events.csv --train_neg data/dblp1/dblp_train_negative_events.csv -o results/dblp1 -e edges -a nominal -p 20 -n 30 --test_pos data/dblp1/dblp_test_positive_events.csv --test_neg data/dblp1/dblp_test_negative_events.csv -u -m 5 -w 1000 -r 0.3 -pu 1.0 -su 0.5 -ep 25 -se 25 -ew 10 --unicross --baseline -s 1

./ewaldis -v --vertices data/dblp2/dblp_vertices.csv --edges data/dblp2/dblp_edges.csv --train_pos data/dblp2/dblp_train_positive_events.csv --train_neg data/dblp2/dblp_train_negative_events.csv -o results/dblp2 -e edges -a nominal -p 20 -n 30 --test_pos data/dblp2/dblp_test_positive_events.csv --test_neg data/dblp2/dblp_test_negative_events.csv -u -m 5 -w 1000 -r 0.3 -pu 1.0 -su 0.5 -ep 25 -se 25 -ew 10 --unicross --baseline -s 1

./ewaldis -v --vertices data/dblp3/dblp_vertices.csv --edges data/dblp3/dblp_edges.csv --train_pos data/dblp3/dblp_train_positive_events.csv --train_neg data/dblp3/dblp_train_negative_events.csv -o results/dblp3 -e edges -a nominal -p 20 -n 30 --test_pos data/dblp3/dblp_test_positive_events.csv --test_neg data/dblp3/dblp_test_negative_events.csv -u -m 5 -w 1000 -r 0.3 -pu 1.0 -su 0.5 -ep 25 -se 25 -ew 10 --unicross --baseline -s 1

./ewaldis -v --vertices data/enron/enron_vertices.csv --edges data/enron/enron_edges.csv --train_pos data/enron/enron_train_positive_events.csv --train_neg data/enron/enron_train_negative_events.csv -o results/enron -e edges -a nominal -p 10 -n 10 --test_pos data/enron/enron_test_positive_events.csv --test_neg data/enron/enron_test_negative_events.csv -m 5 -w 3000 -r 0.3 -pu 1728000 -su 345600 -ep 25 -se 25 -ew 10 --unicross --baseline -s 1

Description of EWALDIS output files

• For each experiment, there is a directory with the following three files for each discriminative pattern:
• results_K.txt with information about the pattern itself:
  • DATA - name of the experiment
  • TOTAL_TIME_PREPARATION - running time of data preparation in seconds (this phase is common for all patterns from one experiment and thus should be counted only once in total time)
  • TOTAL_TIME_MINING - running time of pattern mining in seconds
  • TOTAL_TIME_EVALUATION - running time of pattern evaluation in seconds
  • TIME_UNIT_PRIMARY - primary time unit parameter
  • TIME_UNIT_SECONDARY - secondary time unit parameter
  • RANDOM_WALKS - number of random walks
  • PROB_RESTART - probability of restart
  • MAX_PATTERN_EDGES - maximum number of pattern edges to be found
  • EVOLUATION_EPOCHS - number of epochs in the genetic algorith
  • EVOLUATION_SUBEPOCHS - number of subepochs in the genetic algorith
  • EVALUATION_RANDOM_WALKS - number of random walks used for evaluation
  • PATTERN_EDGES - list of pattern edges in the form of (source_vertex, destination_vertex)
  • PATTERN_SCORES - scores of pattern edges (their fitness from the genetic algorithm)
  • PATTERN_TIMESTAMPS - distribution of relative timestamps for each pattern edge
  • PATTERN_ATTRIBUTES - distribution of attributes for each pattern edge
  • PATTERN_DIRECTIONS - True = edge directed from source to destination, False = the opposite direction; makes sense only for directed graph
  • PATTERN_UNDIRECTED - whether the patten is an undirected graph
  • SAMPLE_EVALUATION_POSITIVE - matching scores on positive events from sample set
  • SAMPLE_EVALUATION_NEGATIVE - matching scores on negative events from sample set
  • TRAIN_EVALUATION_POSITIVE - matching scores on positive events from train set
  • TRAIN_EVALUATION_NEGATIVE - matching scores on negative events from train set
  • TEST_EVALUATION_POSITIVE - matching scores on positive events from test set
  • TEST_EVALUATION_NEGATIVE - matching scores on negative events from test set
• results_K_positive_population.txt
  • For each pattern edge, there are summary statistics of fitness score for each epoch
  • For example, if there are 20 epochs, then first 20 rows belong to the first pattern edge, etc.
  • Each row contains 0%, 10%, 50%, 90%, and 100% percentile of the fitness
  • There are exactly MAX_PATTERN_EDGES * EVOLUATION_EPOCHS rows in the file; if the algorithm finished earlier for a given pattern, then there are missing value
• results_K_negative_population.txt
  • Similar information as in the previous file, but now for each pattern edge and each epoch, there are summary statistics of negative population fitness for each subepoch
  • Thus, there are MAX_PATTERN_EDGES * EVOLUATION_EPOCHS * EVOLUATION_SUBEPOCHS rows
  • Again, if the computation finishes earlier, there may be missing values
• Moreover, there are two csv files used for creating baseline dataset by R scripts: baseline_edges_data_train.csv and baseline_edges_data_test.csv