Update README.md

README.md

@@ -4,7 +4,7 @@ This repo contains the resources (data and scripts) for the workshop entitled "P
 
 ## Repo structure
 
-* _data/_ contains the untagged -- but annotated -- files of the [Old Bailey Corpus](http://fedora.clarin-d.uni-saarland.de/oldbailey/index.html)
+* _data/_ contains the untagged -- but annotated -- files of the [Old Bailey Corpus](http://fedora.clarin-d.uni-saarland.de/oldbailey/index.html) (OBC)
 * _output/_ is used as the default output directory for created knowledge graphs
 	* _output/gold/_ contains some sample knowledge graphs for the years 1720, 1820, and 1913
 * _src/_ contains all scripts
@@ -58,4 +58,38 @@ Install with pip:
 
 **NOTE**: _spacy_ must not be version 2.1.5!
 
-##
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+## How to create knowledge graphs
+
+The file to interact with to generate knowledge graphs from the OBC is _main.py_.
+
+To re-create the sample knowledge graph for the year 1913, simply type:
+
+    python main.py -year 1913 -output_path "../output/example_graph_1913.json"
+
+To display all available options, type:
+
+    python main.py -h
+    
+This gives you:
+
+    usage: main.py [-h] [-year YEAR [YEAR ...]] [-output_path OUTPUT_PATH]
+               [-text_node_simplification_mode {None,classifier,spacy_direct_object}]
+               [-verbose {0,1,2}]
+               [-prune_text_nodes_min_freq PRUNE_TEXT_NODES_MIN_FREQ]
+
+    Building a graph from old bailey corpus.
+
+    optional arguments:
+        -h, --help            show this help message and exit
+        -year YEAR [YEAR ...]
+                        what year(s) the graph should cover, leave empty to
+                        cover all available years
+        -output_path OUTPUT_PATH
+                        where to save output graph
+        -text_node_simplification_mode {None,classifier,spacy_direct_object}
+                        simplify text nodes, e.g.: "murder of x , on the
+                        Monday of(...)" --> "murder"
+        -verbose {0,1,2}      logging level
+        -prune_text_nodes_min_freq PRUNE_TEXT_NODES_MIN_FREQ
+                        how often a text description node has to occur to be
+                        included in the graph
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