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Raw output: coarsetofine.cpp

+001: """Select suitably probable items from a chart and produce whitelist."""
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 002: from __future__ import print_function
 003: from libcpp.vector cimport vector
 004: from libcpp.utility cimport pair
 005: from libcpp.algorithm cimport sort
+006: from .tree import Tree
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+007: from .treetransforms import mergediscnodes, unbinarize, fanout, addbitsets
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 008: from .containers cimport Grammar, Chart, Edge, RankedEdge, LexicalRule, \
 009: 		Label, ItemNo, compactcellidx, CFGtoSmallChartItem, \
 010: 		CFGtoFatChartItem, SmallChartItem, FatChartItem, Whitelist
 011: from .bit cimport nextset, nextunset, anextset, anextunset
 012: from .pcfg cimport CFGChart, DenseCFGChart, SparseCFGChart, CFGItem
 013: from .plcfrs cimport SmallLCFRSChart, FatLCFRSChart
+014: from .kbest import lazykbest
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+015: import numpy as np
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 016: 
 017: include "constants.pxi"
 018: 
 019: ctypedef fused ChartItem_fused:
 020: 	SmallChartItem
 021: 	FatChartItem
 022: 	size_t
 023: 
 024: # alternative: take coarse chart, return fine chart prepopulated with items
 025: # from whitelist. However, this may involve unnecessary work on labels of fine
 026: # chart that will not be used.
 027: # cpdef Chart prunechart(coarsechart, Grammar fine, int k,
 028: # 		bint splitprune, bint markorigin, bint finecfg):
 029: 
 030: 
+031: def prunechart(Chart coarsechart, Grammar fine, k,
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 032: 		bint splitprune, bint markorigin, bint finecfg):
 033: 	"""Produce a white list of selected chart items.
 034: 
 035: 	The criterion is that they occur in the `k`-best derivations of ``chart``,
 036: 	or with posterior probability > `k`. Labels ``X`` in ``coarse.toid`` are
 037: 	projected to the labels in the mapping of the fine grammar, e.g., to ``X``
 038: 	and ``X@n-m`` for a DOP reduction.
 039: 
 040: 	:param coarsechart: a Chart object produced by the PCFG or PLCFRS parser.
 041: 	:param fine: the grammar to map labels to after pruning. must have a
 042: 		mapping to the coarse grammar established by ``fine.getmapping()``.
 043: 	:param k: when ``k >= 1``: number of `k`-best derivations to consider;
 044: 		when ``k==0``, the chart is not pruned but filtered to contain only
 045: 		items that contribute to a complete derivation;
 046: 		when ``0 < k < 1``, inside-outside probabilities are computed and items
 047: 		with a posterior probabilities < `k` are pruned.
 048: 	:param splitprune: coarse stage used a split-PCFG where discontinuous node
 049: 		appear as multiple CFG nodes. Every discontinuous node will result
 050: 		in multiple lookups into whitelist to see whether it should be
 051: 		allowed on the agenda.
 052: 	:param markorigin: in combination with splitprune, coarse labels include an
 053: 		integer to distinguish components; e.g., CFG nodes NP*0 and NP*1
 054: 		map to the discontinuous node NP_2.
 055: 	:returns: ``(whitelist, msg)``
 056: 
 057: 	For LCFRS, the white list is indexed as follows:
 058: 		:whitelisted: ``item in whitelist[label]``, ``item`` is a
 059: 			SmallChartItem or FatChartItem depending on sent. len.
 060: 		:blocked: ``item not in whitelist[label]``
 061: 
 062: 	For a CFG, indexing is as follows:
 063: 		:whitelisted: ``label in whitelist[span]``,
 064: 			``span`` is an integer encoding both begin and end;
 065: 			different from a cell because does not include no. of nonterminals.
 066: 		:blocked: ``label not in whitelist[span]``
 067: 	"""
+068: 	cdef Whitelist whitelist = Whitelist()
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 127: 
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 161: 	"""Compute inside probabilities for a chart given its parse forest."""
 162: 	# this needs to be bottom up, so need order in which items were added
 163: 	# currently separate list, chart.itemsinorder
 164: 	# NB: sorting items by length is not enough,
 165: 	# unaries have to be in the right order...
 166: 
 167: 	# choices for probs:
 168: 	# - normal => underflow (current)
 169: 	# - logprobs => loss of precision w/addition
 170: 	# - normal, scaled => how?
 171: 	cdef ItemNo n, item, leftitem, rightitem
 172: 	cdef Edge edge
 173: 	cdef double prob
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 189: 				prob = (edge.rule.prob
 190: 						* chart.inside[leftitem]
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 195: 
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 197: 	"""Compute outside probabilities for a chart given its parse forest."""
 198: 	cdef ItemNo n, item, leftitem, rightitem
 199: 	cdef Edge edge
 200: 	cdef double outsideprob
 201: 	# cdef double sentprob = chart.inside[chart.root()]
 202: 	# traverse items in top-down order
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 207: 		# can we define outside[item] simply as sentprob - inside[item] ?
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 296: 		# print(chart2)
 297: 
 298: 
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