SprintDataset¶

Implements the SprintDatasetBase and ExternSprintDataset classes, some Dataset subtypes. Note that from the main RETURNN process, you probably want ExternSprintDataset instead.

class SprintDataset.SprintDatasetBase(target_maps=None, str_add_final_zero=False, input_stddev=1.0, bpe=None, **kwargs)[source]

In Sprint, we use this object for multiple purposes: - Multiple epoch handling via SprintInterface.getSegmentList().

For this, we get the segment list from Sprint and use the Dataset shuffling method.
• Fill in data which we get via SprintInterface.feedInput*(). Note that each such input doesn’t necessarily correspond to a single segment. This depends which type of FeatureExtractor is used in Sprint. If we use the BufferedFeatureExtractor in utterance mode, we will get one call for every segment and we get also segmentName as parameter. Otherwise, we will get batches of fixed size - in that case, it doesn’t correspond to the segments. In any case, we use this data as-is as a new seq. Because of that, we cannot really know the number of seqs in advance, nor the total number of time frames, etc.

If you want to use this directly in RETURNN, see ExternSprintDataset.

Parameters: target_maps (dict[str,str|dict]) – e.g. {“speaker”: “speaker_map.txt”} str_add_final_zero (bool) – adds e.g. “orth0” with ‘’-ending input_stddev (float) – if != 1, will divide the input “data” by that bpe (None|dict[str]) – if given, will be opts for BytePairEncoding
SprintCachedSeqsMax = 200[source]
SprintCachedSeqsMin = 100[source]
useMultipleEpochs()[source]

Called via SprintInterface.getSegmentList().

setDimensions(inputDim, outputDim)[source]

Called via python_train.

initSprintEpoch(epoch)[source]

Called by SprintInterface.getSegmentList() when we start a new epoch. We must not call this via self.init_seq_order() because we will already have filled the cache by Sprint before the CRNN train thread starts the epoch.

finalizeSprint()[source]

Called when SprintInterface.getSegmentList() ends.

init_seq_order(epoch=None, seq_list=None)[source]

Called by CRNN train thread when we enter a new epoch.

waitForCrnnEpoch(epoch)[source]

Called by SprintInterface.

is_cached(start, end)[source]
load_seqs(start, end)[source]
addNewData(features, targets=None, segmentName=None)[source]

Adds a new seq. This is called via the Sprint main thread. :param numpy.ndarray features: format (input-feature,time) (via Sprint) :param dict[str,numpy.ndarray|str] targets: format (time) (idx of output-feature) :returns the sorted seq index :rtype: int

finishSprintEpoch(seen_all=True)[source]

Called by SprintInterface.getSegmentList(). This is in a state where Sprint asks for the next segment after we just finished an epoch. Thus, any upcoming self.addNewData() call will contain data from a segment in the new epoch. Thus, we finish the current epoch in Sprint.

get_num_timesteps()[source]
num_seqs[source]
have_seqs()[source]
is_less_than_num_seqs(n)[source]
get_target_list()[source]
set_complete_frac(frac)[source]
get_complete_frac(seq_idx)[source]
get_seq_length(sorted_seq_idx)[source]
get_input_data(sorted_seq_idx)[source]
get_targets(target, sorted_seq_idx)[source]
get_ctc_targets(sorted_seq_idx)[source]
get_tag(sorted_seq_idx)[source]
class SprintDataset.ExternSprintDataset(sprintTrainerExecPath, sprintConfigStr, partitionEpoch=1, **kwargs)[source]

This is a Dataset which you can use directly in RETURNN. You can use it to get any type of data from Sprint (RWTH ASR toolkit), e.g. you can use Sprint to do feature extraction and preprocessing.

This class is like SprintDatasetBase, except that we will start an external Sprint instance ourselves which will forward the data to us over a pipe. The Sprint subprocess will use SprintExternInterface to communicate with us.

Parameters: sprintTrainerExecPath (str|list[str]) – | list[str] | ()->str | list[()->str] | ()->list[str] | ()->list[()->str] sprintConfigStr (str) – via eval_shell_str
reader_thread_proc(child_pid, epoch)[source]
exit_handler()[source]
init_epoch(epoch=None, seq_list=None)[source]
init_seq_order(epoch=None, seq_list=None)[source]
num_seqs[source]
class SprintDataset.SprintCacheDataset(data, **kwargs)[source]

Can directly read Sprint cache files (and bundle files). Supports both cached features and cached alignments. For alignments, you need to provide all options for the AllophoneLabeling class, such as allophone file, etc.

Parameters: data (dict[str,dict[str]]) – data-key -> dict which keys such as filename, see SprintCacheReader constructor
class SprintCacheReader(data_key, filename, type=None, allophone_labeling=None)[source]
Parameters: data_key (str) – e.g. “data” or “classes” filename (str) – to Sprint cache archive type (str|None) – “feat” or “align” allophone_labeling (dict[str]) – kwargs for AllophoneLabeling
read(name)[source]
Parameters: name (str) – content-filename for sprint cache numpy array of shape (time, [num_labels]) numpy.ndarray
init_seq_order(epoch=None, seq_list=None)[source]
get_dataset_seq_for_name(name, seq_idx=-1)[source]
get_data_keys()[source]
Return type: list[str]
get_target_list()[source]
Return type: list[str]
get_tag(sorted_seq_idx)[source]
Return type: str
SprintDataset.demo()[source]