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GeneratingDataset.py
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GeneratingDataset.py
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from Dataset import Dataset, DatasetSeq, convert_data_dims
from Util import class_idx_seq_to_1_of_k
import numpy
class GeneratingDataset(Dataset):
def __init__(self, input_dim, output_dim, window=1, num_seqs=float("inf"), fixed_random_seed=None, **kwargs):
assert window == 1
super(GeneratingDataset, self).__init__(window=window, **kwargs)
assert self.shuffle_frames_of_nseqs == 0
self.num_inputs = input_dim
output_dim = convert_data_dims(output_dim)
if "data" not in output_dim:
output_dim["data"] = [input_dim, 2] # not sparse
self.num_outputs = output_dim
self.expected_load_seq_start = 0
self._num_seqs = num_seqs
self.random = numpy.random.RandomState(1)
self.fixed_random_seed = fixed_random_seed # useful when used as eval dataset
def init_seq_order(self, epoch=None, seq_list=None):
"""
:type epoch: int|None
:param seq_list: predefined order. doesn't make sense here
This is called when we start a new epoch, or at initialization.
"""
super(GeneratingDataset, self).init_seq_order(epoch=epoch)
assert not seq_list, "predefined order doesn't make sense for %s" % self.__class__.__name__
self.random.seed(self.fixed_random_seed or epoch or 1)
self._num_timesteps = 0
self.reached_final_seq = False
self.expected_load_seq_start = 0
self.added_data = []; " :type: list[DatasetSeq] "
return True
def _cleanup_old_seqs(self, seq_idx_end):
i = 0
while i < len(self.added_data):
if self.added_data[i].seq_idx >= seq_idx_end:
break
i += 1
del self.added_data[:i]
def _get_seq(self, seq_idx):
for data in self.added_data:
if data.seq_idx == seq_idx:
return data
return None
def is_cached(self, start, end):
# Always False, to force that we call self._load_seqs().
# This is important for our buffer management.
return False
def _load_seqs(self, start, end):
"""
:param int start: inclusive seq idx start
:param int end: exclusive seq idx end
"""
# We expect that start increase monotonic on each call
# for not-yet-loaded data.
# This will already be called with _load_seqs_superset indices.
assert start >= self.expected_load_seq_start
if start > self.expected_load_seq_start:
# Cleanup old data.
self._cleanup_old_seqs(start)
self.expected_load_seq_start = start
if self.added_data:
start = max(self.added_data[-1].seq_idx + 1, start)
if end > self.num_seqs:
end = self.num_seqs
if end >= self.num_seqs:
self.reached_final_seq = True
seqs = [self.generate_seq(seq_idx=seq_idx) for seq_idx in range(start, end)]
self._num_timesteps += sum([seq.num_frames for seq in seqs])
self.added_data += seqs
def generate_seq(self, seq_idx):
"""
:type seq_idx: int
:rtype: DatasetSeq
"""
raise NotImplementedError
def _shuffle_frames_in_seqs(self, start, end):
assert False, "Shuffling in GeneratingDataset does not make sense."
def get_num_timesteps(self):
assert self.reached_final_seq
return self._num_timesteps
@property
def num_seqs(self):
return self._num_seqs
def get_seq_length(self, sorted_seq_idx):
# get_seq_length() can be called before the seq is loaded via load_seqs().
# Thus, we just call load_seqs() ourselves here.
assert sorted_seq_idx >= self.expected_load_seq_start
self.load_seqs(self.expected_load_seq_start, sorted_seq_idx + 1)
return self._get_seq(sorted_seq_idx).num_frames
def get_input_data(self, sorted_seq_idx):
return self._get_seq(sorted_seq_idx).features
def get_targets(self, target, sorted_seq_idx):
return self._get_seq(sorted_seq_idx).targets[target]
def get_ctc_targets(self, sorted_seq_idx):
assert self._get_seq(sorted_seq_idx).ctc_targets
def get_tag(self, sorted_seq_idx):
return self._get_seq(sorted_seq_idx).seq_tag
class Task12AXDataset(GeneratingDataset):
"""
12AX memory task.
This is a simple memory task where there is an outer loop and an inner loop.
Description here: http://psych.colorado.edu/~oreilly/pubs-abstr.html#OReillyFrank06
"""
_input_classes = "123ABCXYZ"
_output_classes = "LR"
def __init__(self, **kwargs):
super(Task12AXDataset, self).__init__(
input_dim=len(self._input_classes),
output_dim=len(self._output_classes),
**kwargs)
def get_random_seq_len(self):
return self.random.randint(10, 100)
def generate_input_seq(self, seq_len):
"""
Somewhat made up probability distribution.
Try to make in a way that at least some "R" will occur in the output seq.
Otherwise, "R"s are really rare.
"""
seq = self.random.choice(["", "1", "2"])
while len(seq) < seq_len:
if self.random.uniform() < 0.5:
seq += self.random.choice(list("12"))
if self.random.uniform() < 0.9:
seq += self.random.choice(["AX", "BY"])
while self.random.uniform() < 0.5:
seq += self.random.choice(list(self._input_classes))
return list(map(self._input_classes.index, seq[:seq_len]))
@classmethod
def make_output_seq(cls, input_seq):
"""
:type input_seq: list[int]
:rtype: list[int]
"""
outer_state = ""
inner_state = ""
input_classes = cls._input_classes
output_seq_str = ""
for i in input_seq:
c = input_classes[i]
o = "L"
if c in "12":
outer_state = c
elif c in "AB":
inner_state = c
elif c in "XY":
if outer_state + inner_state + c in ["1AX", "2BY"]:
o = "R"
inner_state = ""
# Ignore other cases, "3CZ".
output_seq_str += o
return list(map(cls._output_classes.index, output_seq_str))
def estimate_output_class_priors(self, num_trials, seq_len=10):
"""
:type num_trials: int
:rtype: (float, float)
"""
count_l, count_r = 0, 0
for i in range(num_trials):
input_seq = self.generate_input_seq(seq_len)
output_seq = self.make_output_seq(input_seq)
count_l += output_seq.count(0)
count_r += output_seq.count(1)
return float(count_l) / (num_trials * seq_len), float(count_r) / (num_trials * seq_len)
def generate_seq(self, seq_idx):
seq_len = self.get_random_seq_len()
input_seq = self.generate_input_seq(seq_len)
output_seq = self.make_output_seq(input_seq)
features = class_idx_seq_to_1_of_k(input_seq, num_classes=len(self._input_classes))
targets = numpy.array(output_seq)
return DatasetSeq(seq_idx=seq_idx, features=features, targets=targets)
class TaskEpisodicCopyDataset(GeneratingDataset):
"""
Episodic Copy memory task.
This is a simple memory task where we need to remember a sequence.
Described in: http://arxiv.org/abs/1511.06464
Also tested for Associative LSTMs.
This is a variant where the lengths are random, both for the chars and for blanks.
"""
# Blank, delimiter and some chars.
_input_classes = " .01234567"
_output_classes = _input_classes
def __init__(self, **kwargs):
super(TaskEpisodicCopyDataset, self).__init__(
input_dim=len(self._input_classes),
output_dim=len(self._output_classes),
**kwargs)
def generate_input_seq(self):
seq = ""
# Start with random chars.
rnd_char_len = self.random.randint(1, 10)
seq += "".join([self.random.choice(list(self._input_classes[2:]))
for i in range(rnd_char_len)])
blank_len = self.random.randint(1, 100)
seq += " " * blank_len # blanks
seq += "." # 1 delim
seq += "." * (rnd_char_len + 1) # we wait for the outputs + 1 delim
return list(map(self._input_classes.index, seq))
@classmethod
def make_output_seq(cls, input_seq):
"""
:type input_seq: list[int]
:rtype: list[int]
"""
input_classes = cls._input_classes
input_mem = ""
output_seq_str = ""
state = 0
for i in input_seq:
c = input_classes[i]
if state == 0:
output_seq_str += " "
if c == " ": pass # just ignore
elif c == ".": state = 1 # start with recall now
else: input_mem += c
else: # recall from memory
# Ignore input.
if not input_mem:
output_seq_str += "."
else:
output_seq_str += input_mem[:1]
input_mem = input_mem[1:]
return list(map(cls._output_classes.index, output_seq_str))
def generate_seq(self, seq_idx):
input_seq = self.generate_input_seq()
output_seq = self.make_output_seq(input_seq)
features = class_idx_seq_to_1_of_k(input_seq, num_classes=len(self._input_classes))
targets = numpy.array(output_seq)
return DatasetSeq(seq_idx=seq_idx, features=features, targets=targets)
class TaskXmlModelingDataset(GeneratingDataset):
"""
XML modeling memory task.
This is a memory task where we need to remember a stack.
Defined in Jozefowicz et al. (2015).
Also tested for Associative LSTMs.
"""
# Blank, XML-tags and some chars.
_input_classes = " <>/abcdefgh"
_output_classes = _input_classes
def __init__(self, limit_stack_depth=4, **kwargs):
super(TaskXmlModelingDataset, self).__init__(
input_dim=len(self._input_classes),
output_dim=len(self._output_classes),
**kwargs)
self.limit_stack_depth = limit_stack_depth
def generate_input_seq(self):
# Because this is a prediction task, start with blank,
# and the output seq should predict the next char after the blank.
seq = " "
xml_stack = []
while True:
if not xml_stack or (len(xml_stack) < self.limit_stack_depth and self.random.rand() > 0.6):
tag_len = self.random.randint(1, 10)
tag = "".join([self.random.choice(list(self._input_classes[4:]))
for i in range(tag_len)])
seq += "<%s>" % tag
xml_stack += [tag]
else:
seq += "</%s>" % xml_stack.pop()
if not xml_stack and self.random.rand() > 0.2:
break
return list(map(self._input_classes.index, seq))
@classmethod
def make_output_seq(cls, input_seq):
"""
:type input_seq: list[int]
:rtype: list[int]
"""
input_classes = cls._input_classes
input_seq_str = "".join(cls._input_classes[i] for i in input_seq)
xml_stack = []
output_seq_str = ""
state = 0
for c in input_seq_str:
if c in " >":
output_seq_str += "<" # We expect an open char.
assert state != 1, repr(input_seq_str)
state = 1 # expect beginning of tag
elif state == 1: # in beginning of tag
output_seq_str += " " # We don't know yet.
assert c == "<", repr(input_seq_str)
state = 2
elif state == 2: # first char in tag
if c == "/":
assert xml_stack, repr(input_seq_str)
output_seq_str += xml_stack[-1][0]
xml_stack[-1] = xml_stack[-1][1:]
state = 4 # closing tag
else: # opening tag
output_seq_str += " " # We don't know yet.
assert c not in " <>/", repr(input_seq_str)
state = 3
xml_stack += [c]
elif state == 3: # opening tag
output_seq_str += " " # We don't know.
xml_stack[-1] += c
elif state == 4: # closing tag
assert xml_stack, repr(input_seq_str)
if not xml_stack[-1]:
output_seq_str += ">"
xml_stack.pop()
state = 0
else:
output_seq_str += xml_stack[-1][0]
xml_stack[-1] = xml_stack[-1][1:]
else:
assert False, "invalid state %i. input %r" % (state, input_seq_str)
return list(map(cls._output_classes.index, output_seq_str))
def generate_seq(self, seq_idx):
input_seq = self.generate_input_seq()
output_seq = self.make_output_seq(input_seq)
features = class_idx_seq_to_1_of_k(input_seq, num_classes=len(self._input_classes))
targets = numpy.array(output_seq)
return DatasetSeq(seq_idx=seq_idx, features=features, targets=targets)
class TaskVariableAssignmentDataset(GeneratingDataset):
"""
Variable Assignment memory task.
This is a memory task to test for key-value retrieval.
Defined in Associative LSTM paper.
"""
# Blank/Delim/End, Store/Query, and some chars for key/value.
_input_classes = " ,.SQ()abcdefgh"
_output_classes = _input_classes
def __init__(self, **kwargs):
super(TaskVariableAssignmentDataset, self).__init__(
input_dim=len(self._input_classes),
output_dim=len(self._output_classes),
**kwargs)
def generate_input_seq(self):
seq = ""
from collections import OrderedDict
store = OrderedDict()
# First the assignments.
num_assignments = self.random.randint(1, 5)
for i in range(num_assignments):
key_len = self.random.randint(2, 5)
while True: # find unique key
key = "".join([self.random.choice(list(self._input_classes[7:]))
for i in range(key_len)])
if key not in store: break
value_len = self.random.randint(1, 2)
value = "".join([self.random.choice(list(self._input_classes[7:]))
for i in range(value_len)])
if seq: seq += ","
seq += "S(%s,%s)" % (key, value)
store[key] = value
# Now one query.
key = self.random.choice(store.keys())
value = store[key]
seq += ",Q(%s)" % key
seq += "%s." % value
return list(map(self._input_classes.index, seq))
@classmethod
def make_output_seq(cls, input_seq):
"""
:type input_seq: list[int]
:rtype: list[int]
"""
input_classes = cls._input_classes
input_seq_str = "".join(cls._input_classes[i] for i in input_seq)
store = {}
key, value = "", ""
output_seq_str = ""
state = 0
for c in input_seq_str:
if state == 0:
key = ""
if c == "S": state = 1 # store
elif c == "Q": state = 2 # query
elif c in " ,": pass # can be ignored
else: assert False, "c %r in %r" % (c, input_seq_str)
output_seq_str += " "
elif state == 1: # store
assert c == "(", repr(input_seq_str)
state = 1.1
output_seq_str += " "
elif state == 1.1: # store.key
if c == ",":
assert key
value = ""
state = 1.5 # store.value
else:
assert c not in " .,SQ()", repr(input_seq_str)
key += c
output_seq_str += " "
elif state == 1.5: # store.value
if c == ")":
assert value
store[key] = value
state = 0
else:
assert c not in " .,SQ()", repr(input_seq_str)
value += c
output_seq_str += " "
elif state == 2: # query
assert c == "(", repr(input_seq_str)
state = 2.1
output_seq_str += " "
elif state == 2.1: # query.key
if c == ")":
value = store[key]
output_seq_str += value[0]
value = value[1:]
state = 2.5
else:
assert c not in " .,SQ()", repr(input_seq_str)
key += c
output_seq_str += " "
elif state == 2.5: # query result
assert c not in " .,SQ()", repr(input_seq_str)
if value:
output_seq_str += value[0]
value = value[1:]
else:
output_seq_str += "."
state = 2.6
elif state == 2.6: # query result end
assert c == ".", repr(input_seq_str)
output_seq_str += " "
else:
assert False, "invalid state %i, input %r" % (state, input_seq_str)
return list(map(cls._output_classes.index, output_seq_str))
def generate_seq(self, seq_idx):
input_seq = self.generate_input_seq()
output_seq = self.make_output_seq(input_seq)
features = class_idx_seq_to_1_of_k(input_seq, num_classes=len(self._input_classes))
targets = numpy.array(output_seq)
return DatasetSeq(seq_idx=seq_idx, features=features, targets=targets)
class DummyDataset(GeneratingDataset):
def __init__(self, input_dim, output_dim, num_seqs, seq_len=2,
input_max_value=10.0, input_shift=None, input_scale=None, **kwargs):
super(DummyDataset, self).__init__(input_dim=input_dim, output_dim=output_dim, num_seqs=num_seqs, **kwargs)
self.seq_len = seq_len
self.input_max_value = input_max_value
if input_shift is None: input_shift = -input_max_value / 2.0
self.input_shift = input_shift
if input_scale is None: input_scale = 1.0 / self.input_max_value
self.input_scale = input_scale
def generate_seq(self, seq_idx):
seq_len = self.seq_len
i1 = seq_idx
i2 = i1 + seq_len * self.num_inputs
features = numpy.array([((i % self.input_max_value) + self.input_shift) * self.input_scale
for i in range(i1, i2)]).reshape((seq_len, self.num_inputs))
i1, i2 = i2, i2 + seq_len
targets = numpy.array([i % self.num_outputs["classes"][0]
for i in range(i1, i2)])
return DatasetSeq(seq_idx=seq_idx, features=features, targets=targets)
class StaticDataset(GeneratingDataset):
def __init__(self, data, target_list=None, output_dim=None, input_dim=None, **kwargs):
"""
:type data: list[dict[str,numpy.ndarray]]
"""
assert len(data) > 0
self.data = data
num_seqs = len(data)
first_data = data[0]
assert "data" in first_data # input
if target_list is None:
target_list = []
for target in first_data.keys():
if target == "data": continue
target_list.append(target)
else:
for target in target_list:
assert target in first_data
self.target_list = target_list
if output_dim is None:
output_dim = {}
output_dim = convert_data_dims(output_dim)
first_data_input = first_data["data"]
assert len(first_data_input.shape) <= 2 # (time[,dim])
if input_dim is None:
if "data" in output_dim:
input_dim = output_dim["data"][0]
else:
input_dim = first_data_input.shape[1]
for target in target_list:
first_data_output = first_data[target]
assert len(first_data_output.shape) <= 2 # (time[,dim])
if target in output_dim:
assert output_dim[target][1] == len(first_data_output.shape)
if len(first_data_output.shape) >= 2:
assert output_dim[target][0] == first_data_output.shape[1]
else:
assert len(first_data_output.shape) == 2, "We expect not sparse. Or specify it explicitly in output_dim."
output_dim[target] = [first_data_output.shape[1], 2]
super(StaticDataset, self).__init__(input_dim=input_dim, output_dim=output_dim, num_seqs=num_seqs, **kwargs)
def generate_seq(self, seq_idx):
data = self.data[seq_idx]
return DatasetSeq(seq_idx=seq_idx,
features=data["data"],
targets={target: data[target] for target in self.target_list})
def get_target_list(self):
return self.target_list
class CopyTaskDataset(GeneratingDataset):
def __init__(self, nsymbols, minlen=0, maxlen=0, minlen_epoch_factor=0, maxlen_epoch_factor=0, **kwargs):
# Sparse data.
super(CopyTaskDataset, self).__init__(input_dim=nsymbols,
output_dim={"data": [nsymbols, 1],
"classes": [nsymbols, 1]},
**kwargs)
assert nsymbols <= 256
self.nsymbols = nsymbols
self.minlen = minlen
self.maxlen = maxlen
self.minlen_epoch_factor = minlen_epoch_factor
self.maxlen_epoch_factor = maxlen_epoch_factor
def get_random_seq_len(self):
assert isinstance(self.epoch, int)
minlen = int(self.minlen + self.minlen_epoch_factor * self.epoch)
maxlen = int(self.maxlen + self.maxlen_epoch_factor * self.epoch)
assert 0 < minlen <= maxlen
return self.random.randint(minlen, maxlen + 1)
def generate_seq(self, seq_idx):
"""
:type seq_idx: int
:rtype: DatasetSeq
"""
seq_len = self.get_random_seq_len()
seq = [self.random.randint(0, self.nsymbols) for i in range(seq_len)]
seq_np = numpy.array(seq, dtype="int8")
return DatasetSeq(seq_idx=seq_idx, features=seq_np, targets={"classes": seq_np})
def demo():
import better_exchook
better_exchook.install()
import sys
dsclazzeval = sys.argv[1]
dataset = eval(dsclazzeval)
assert isinstance(dataset, GeneratingDataset)
assert dataset._input_classes and dataset._output_classes
assert dataset.num_outputs["data"][1] == 2 # expect 1-hot
assert dataset.num_outputs["classes"][1] == 1 # expect sparse
for i in range(10):
print("Seq idx %i:" % i)
s = dataset.generate_seq(i)
assert isinstance(s, DatasetSeq)
features = s.features
output_seq = s.targets["classes"]
assert features.ndim == 2
assert output_seq.ndim == 1
input_seq = numpy.argmax(features, axis=1)
input_seq_str = "".join([dataset._input_classes[i] for i in input_seq])
output_seq_str = "".join([dataset._output_classes[i] for i in output_seq])
print(" %r" % input_seq_str)
print(" %r" % output_seq_str)
assert features.shape[1] == dataset.num_outputs["data"][0]
assert features.shape[0] == output_seq.shape[0]
if __name__ == "__main__":
demo()