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Added rd grammar

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cif2cif 2017-04-20 17:27:44 +02:00
parent 1a38307a2e
commit 3c96a2b12c
1 changed files with 24 additions and 3 deletions
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27
nlp/4_2_Syntactic_Processing.ipynb
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@ -233,12 +233,14 @@
"\n",
"We can use the StandfordParser that is integrated in NLTK, but it requires to configure the CLASSPATH, which can be a bit annoying. Instead, we are going to see some demos to understand how grammars work. In case you are interested, you can consult the [manual](http://www.nltk.org/api/nltk.parse.html) to run it.\n",
"\n",
"In the following example, you will run an interactive context-free parser, called [shift-reduce parser](http://www.nltk.org/book/ch08.html).\n",
"The panel on the left shows the grammar as a list of production rules. The panel on the right contains the stack and the remaining input.\n",
"In the following example, you will run two interactive context-free parser (http://www.nltk.org/book/ch08.html): shift-reduce parser (botton-up) and recursive descent parser (top-down).\n",
"\n",
"\n",
"First, we run the shift-reduce parser. The panel on the left shows the grammar as a list of production rules. The panel on the right contains the stack and the remaining input.\n",
"\n",
"You should:\n",
"* Run pressing 'step' until the sentence is fully analyzed. With each step, the parser either shifts one word onto the stack or reduces two subtrees of the stack into a new subtree.\n",
"* Try to act as the parser. Instead of pressing 'step', press 'shift' and 'reduce'. Follow the 'always shift before reduce' rule. It is likely you will reach a state where the parser cannot proceed. You can go back with 'Undo'."
"* Try to act as the parser. Instead of pressing 'step', press 'shift' and 'reduce'. Follow the 'always shift before reduce' rule. It is likely you will reach a state where the parser cannot proceed. You can go back with 'Undo'. You can try to change the order of the grammar rules or add new grammar rules."
]
},
{
@ -253,6 +255,25 @@
"srparser_app.app()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Now we run the recursive descent parser. Observe the different parsing strategies and consult the [book](http://www.nltk.org/api/nltk.parse.html)."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"from nltk.app import rdparser_app\n",
"rdparser_app.app()"
]
},
{
"cell_type": "markdown",
"metadata": {},