def run( pos_file, neg_file, out_dir, format, align_count, mapping ):
# Open merit output
merit_out = open( os.path.join( out_dir, 'merits.txt' ), 'w' )
# Read integer sequences
pos_strings = list( io.get_reader( pos_file, format, None ) )
neg_strings = list( io.get_reader( neg_file, format, None ) )
symbol_count = mapping.get_out_size()
# Collapse
while symbol_count > stop_size:
print >> sys.stderr, "Collapsing from:", symbol_count
best_mapping = None
best_merit = 0
pb = ProgressBar( 0, symbol_count * ( symbol_count - 1 ) / 2, 78 )
count = 0
pairs = all_pairs( symbol_count )
for i, j in pairs:
collapsed = mapping.collapse( i, j )
merit = calc_merit( pos_strings, neg_strings, collapsed )
if merit > best_merit:
best_merit = merit
best_mapping = collapsed
count += 1
pb.update_and_print( count, sys.stderr )
mapping = best_mapping
symbol_count -= 1
# Append merit to merit output
print >>merit_out, symbol_count, best_merit
print >>sys.stderr, "\nBest Merit %d." % best_merit,
# Write best mapping to a file
mapping_out = open( os.path.join( out_dir, "%03d.mapping" % symbol_count ), 'w' )
for i, symbol in enumerate( mapping.get_table() ):
print >>mapping_out, str.join( '', rp.mapping.DNA.reverse_map( i, align_count ) ), symbol
mapping_out.close()
def run(self):
mapping = self.starting_mapping
# Open merit output
merit_out = open(os.path.join(self.out_dir, "merits.txt"), "w")
# Read training data and build seperate sets for sequence (translated
# to ints in range(0,4)) and alignment (translated with self.atom_mapping)
print >>sys.stderr, "Loading training data"
self.pos_genome_seqs, self.pos_strings = self.read_maf(self.pos_fname)
self.neg_genome_seqs, self.neg_strings = self.read_maf(self.neg_fname)
# Count how many times each atom appears in the training data
atom_counts = zeros(self.atom_mapping.get_out_size())
for string in chain(self.pos_strings, self.neg_strings):
for val in string:
atom_counts[val] += 1
# Valid candiates for expansion must occur more than 10 times in the training data
can_expand = compress(atom_counts > 10, arange(len(atom_counts)))
# Handling bad columns in the training data is not obvious, so don't do it for now
# for string in chain( pos_strings, neg_strings ):
# assert -1 not in string, "Cannot have invalid columns (map to -1) in training data"
best_merit_overall = 0
best_mapping_overall = None
index_best_merit_overall = 0
out_counter = 0
step_counter = 0
#
last_force_counter = 0
print >>sys.stderr, "Searching"
# Collapse
while 1:
symbol_count = mapping.get_out_size()
best_merit = 0
best_mapping = None
clock = time.clock()
cv_runs = 0
# First try a bunch of collapses
if symbol_count > stop_size:
pairs = all_pairs(symbol_count)
if len(pairs) > samp_size_collapse:
pairs = random.sample(pairs, samp_size_collapse)
for i, j in pairs:
new_mapping = mapping.collapse(i, j)
merit = self.calc_merit(new_mapping)
cv_runs += 1
if merit > best_merit:
best_merit = merit
best_mapping = new_mapping
# Also try a bunch of expansions
elements = random.sample(can_expand, samp_size_expand)
for i in elements:
new_mapping = mapping.expand(i)
if new_mapping.get_out_size() == symbol_count:
continue
merit = self.calc_merit(new_mapping)
cv_runs += 1
if merit > best_merit:
best_merit = merit
best_mapping = new_mapping
clock = time.clock() - clock
mapping = best_mapping
# Append merit to merit output
print >> merit_out, step_counter, symbol_count, best_merit
merit_out.flush()
if best_merit >= best_merit_overall:
best_merit_overall = best_merit
best_mapping_overall = best_mapping
# So we know what step the best mapping was encountered at
best_merit_overall_index = step_counter
restart_counter = step_counter
# Reset the counter we use to force expansions
last_force_counter = step_counter
# Write best mapping to a file
mapping_out = open(os.path.join(self.out_dir, "%03d.mapping" % out_counter), "w")
for i, symbol in enumerate(self.atom_mapping.get_table()):
# Apply the 'second' mapping to the atom symbol
if symbol >= 0:
symbol = mapping[symbol]
print >> mapping_out, str.join("", TS_DNA.reverse_map(i, self.align_count)), symbol
mapping_out.close()
out_counter += 1
print >>sys.stderr, "%06d, New best merit: %2.2f%%, size: %d, overall best: %2.2f%% at %06d, cvs per sec: %f" % (
step_counter,
best_merit * 100,
mapping.get_out_size(),
best_merit_overall * 100,
best_merit_overall_index,
cv_runs / clock,
)
# If we have gone 50 steps without improving over the best, restart from best
if step_counter > restart_counter + 50:
print >>sys.stderr, "Restarting from best mapping"
print >> merit_out, step_counter, "RESTART"
mapping = best_mapping_overall
restart_counter = step_counter
# Immediately force expansions after restart
last_force_counter = 0
if step_counter > last_force_counter + 20:
last_force_counter = step_counter
print >>sys.stderr, "Forcing expansions"
print >> merit_out, step_counter, "FORCED EXPANSIONS"
for i in range(5):
symbol_count = mapping.get_out_size()
best_merit = 0
best_mapping = None
for i in random.sample(can_expand, samp_size_expand):
new_mapping = mapping.expand(i)
if new_mapping.get_out_size() == symbol_count:
continue
merit = self.calc_merit(new_mapping)
if merit > best_merit:
best_merit = merit
best_mapping = new_mapping
mapping = best_mapping
step_counter += 1
def run( ts_fnames, out_dir, format, align_count, atom_mapping, mapping, modname, modorder ):
samp_size_collapse = 30
samp_size_expand = 10
if mpi:
global pypar, node_id, nodes
# Startup pypar and get some info about what node we are
pypar = __import__( 'pypar' )
nodes = pypar.size()
node_id = pypar.rank()
print "I am node %d of %d" % ( node_id, nodes )
# Modify these, they get split over nodes
samp_size_collapse = samp_size_collapse // nodes
samp_size_expand = samp_size_expand // nodes
# Open merit output
merit_out = open( os.path.join( out_dir, 'merits.txt' ), 'w' )
# Read integer sequences
message( "Loading training data" )
training_sets = []
for fname in ts_fnames:
strings = []
skipped = 0
for s in rp.io.get_reader( open( fname ), format, None ):
# Apply initial mapping
s = atom_mapping.translate( s )
# Ensure required columns
if sum( s != -1 ) < min_cols:
skipped += 1
continue
# Add to set
strings.append( s )
# Informational
message( "Loaded training data from '%s', found %d usable strings and %d skipped" \
% ( fname, len( strings ), skipped ) )
training_sets.append( strings )
# Count how many times each atom appears in the training data, valid
# candiates for expansion must occur more than 10 times in the training
# data.
message( "Finding expandable atoms" )
atom_counts = zeros( atom_mapping.get_out_size() )
for string in chain( * training_sets ):
for val in string:
atom_counts[ int( val ) ] += 1
can_expand = compress( atom_counts > 10, arange( len( atom_counts ) ) )
# Open merit output
merit_out = open( os.path.join( out_dir, 'merits.txt' ), 'w' )
best_merit_overall = 0
best_mapping_overall = None
index_best_merit_overall = 0
out_counter = 0
step_counter = 0
last_force_counter = 0
message( "Searching" )
# Collapse
while 1:
clock = time.clock()
cv_runs = 0
if mpi:
# Sync up nodes at start of each pass
pypar.barrier()
symbol_count = mapping.get_out_size()
best_i = None
best_j = None
best_merit = 0
best_mapping = None
# First try a bunch of collapses
if symbol_count > stop_size:
# Select some random pairs from the region owned by this node
pairs = all_pairs( symbol_count )
if mpi:
lo, hi = pypar.balance( len( pairs ), nodes, node_id )
pairs = pairs[lo:hi]
if len( pairs ) > samp_size_collapse:
pairs = random.sample( pairs, samp_size_collapse )
# Try collapsing each pair
for i, j in pairs:
new_mapping = mapping.collapse( i, j )
merit = calc_merit( training_sets, new_mapping, modname, modorder )
cv_runs += 1
if merit > best_merit:
best_i, best_j = i, j
best_merit = merit
best_mapping = new_mapping
# Also try a bunch of expansions
if mpi:
lo, hi = pypar.balance( len( can_expand ), nodes, node_id )
elements = random.sample( can_expand[lo:hi], samp_size_expand )
else:
elements = random.sample( can_expand, samp_size_expand )
for i in elements:
new_mapping = mapping.expand( i )
if new_mapping.get_out_size() == symbol_count:
continue
merit = calc_merit( training_sets, new_mapping, modname, modorder )
cv_runs += 1
if merit > best_merit:
best_i, best_j = i, None
best_merit = merit
best_mapping = new_mapping
clock = time.clock() - clock
if mpi:
best_i, best_j, best_merit, cv_runs = sync_nodes( best_i, best_j, best_merit, cv_runs )
# Collapse or expand (if j is None) to get the overall best mapping
if best_j is None:
best_mapping = mapping.expand( best_i )
else:
best_mapping = mapping.collapse( best_i, best_j )
mapping = best_mapping
# Append merit to merit output
if not mpi or node_id == 0:
print >>merit_out, step_counter, symbol_count, best_merit
merit_out.flush()
if best_merit >= best_merit_overall:
best_merit_overall = best_merit
best_mapping_overall = best_mapping
# So we know what step the best mapping was encountered at
best_merit_overall_index = step_counter
restart_counter = step_counter
# Reset the counter we use to force expansions
last_force_counter = step_counter
# Write best mapping to a file
if not mpi or node_id == 0:
write_mapping( mapping, os.path.join( out_dir, "%03d.mapping" % out_counter ) )
out_counter += 1
message( "%06d, New best merit: %2.2f%%, size: %d, overall best: %2.2f%% at %06d, cvs/sec: %f" \
% ( step_counter, best_merit * 100, mapping.get_out_size(), best_merit_overall * 100, best_merit_overall_index, cv_runs/clock ) )
# If we have gone 50 steps without improving over the best, restart from best
if step_counter > restart_counter + 50:
message( "Restarting from best mapping" )
if not mpi or node_id == 0:
print >>merit_out, step_counter, "RESTART"
mapping = best_mapping_overall
restart_counter = step_counter
# Immediately force expansions after restart
last_force_counter = 0
if step_counter > last_force_counter + 20:
last_force_counter = step_counter
message( "Forcing expansions" )
if not mpi or node_id == 0:
print >>merit_out, step_counter, "FORCED EXPANSIONS"
if mpi:
lo, hi = pypar.balance( len( can_expand ), nodes, node_id )
my_can_expand = can_expand[lo:hi]
else:
my_can_expand = can_expand
for i in range( 5 ):
symbol_count = mapping.get_out_size()
best_merit = 0
best_i = None
best_mapping = None
for i in random.sample( my_can_expand, samp_size_expand ):
new_mapping = mapping.expand( i )
if new_mapping.get_out_size() == symbol_count:
continue
merit = calc_merit( training_sets, new_mapping, modname, modorder )
if merit > best_merit:
best_i = i
best_merit = merit
best_mapping = new_mapping
if mpi:
best_i, best_j, best_merit, cv_runs = sync_nodes( best_i, None, best_merit, 0 )
assert best_j == None
best_mapping = mapping.expand( best_i )
if best_mapping:
mapping = best_mapping
step_counter += 1
def run( pos_file, neg_file, out_dir, format, align_count, mapping ):
# Open merit output
merit_out = open( os.path.join( out_dir, 'merits.txt' ), 'w' )
# Read integer sequences
pos_strings = list( rp.io.get_reader( pos_file, format, None ) )
neg_strings = list( rp.io.get_reader( neg_file, format, None ) )
symbol_count = mapping.get_out_size()
# Collapse
while symbol_count > stop_size:
# Sync nodes on each pass, may not be required
pypar.barrier()
if node_id == 0:
print "Collapsing from:", symbol_count
pairs = all_pairs( symbol_count )
# Decide which subrange of all pairs this node will handle
lo, hi = pypar.balance( len( pairs ), nodes, node_id )
# Find best collapsed mapping in interval
best_i, best_j, best_merit = None, None, 0
for i, j in pairs[lo:hi]:
merit = calc_merit( pos_strings, neg_strings, mapping.collapse( i, j ) )
if merit > best_merit:
best_i, best_j, best_merit = i, j, merit
# Aggregate results
if node_id != 0:
# Send best i, j, merit to the master
pypar.send( ( best_i, best_j, merit ), 0 )
else:
# I am the master, get results from all other nodes and determine
# which had the best merit
for other_node_id in range( 1, nodes ):
i, j, merit = pypar.receive( other_node_id )
if merit > best_merit:
best_i, best_j, best_merit = i, j, merit
# Collapse the two symbols that resulted in the best merit
mapping = mapping.collapse( best_i, best_j )
symbol_count -= 1
# Ensure only the master writes files
if node_id == 0:
# Append merit to merit output
print >>merit_out, symbol_count, best_merit
print "\nBest Merit %d." % best_merit,
# Write best mapping to a file
mapping_out = open( os.path.join( out_dir, "%03d.mapping" % symbol_count ), 'w' )
for i, symbol in enumerate( mapping.get_table() ):
print >>mapping_out, str.join( '', rp.mapping.DNA.reverse_map( i, align_count ) ), symbol
mapping_out.close()