import numpy import zlib import srsly from thinc.backends import NumpyOps from ..compat import copy_reg from ..tokens import Doc from ..attrs import SPACY, ORTH, intify_attr from ..errors import Errors class DocBin(object): """Pack Doc objects for binary serialization. The DocBin class lets you efficiently serialize the information from a collection of Doc objects. You can control which information is serialized by passing a list of attribute IDs, and optionally also specify whether the user data is serialized. The DocBin is faster and produces smaller data sizes than pickle, and allows you to deserialize without executing arbitrary Python code. The serialization format is gzipped msgpack, where the msgpack object has the following structure: { "attrs": List[uint64], # e.g. [TAG, HEAD, ENT_IOB, ENT_TYPE] "tokens": bytes, # Serialized numpy uint64 array with the token data "spaces": bytes, # Serialized numpy boolean array with spaces data "lengths": bytes, # Serialized numpy int32 array with the doc lengths "strings": List[unicode] # List of unique strings in the token data } Strings for the words, tags, labels etc are represented by 64-bit hashes in the token data, and every string that occurs at least once is passed via the strings object. This means the storage is more efficient if you pack more documents together, because you have less duplication in the strings. A notable downside to this format is that you can't easily extract just one document from the DocBin. """ def __init__(self, attrs=None, store_user_data=False): """Create a DocBin object to hold serialized annotations. attrs (list): List of attributes to serialize. 'orth' and 'spacy' are always serialized, so they're not required. Defaults to None. store_user_data (bool): Whether to include the `Doc.user_data`. RETURNS (DocBin): The newly constructed object. DOCS: https://spacy.io/api/docbin#init """ attrs = attrs or [] attrs = sorted([intify_attr(attr) for attr in attrs]) self.attrs = [attr for attr in attrs if attr != ORTH and attr != SPACY] self.attrs.insert(0, ORTH) # Ensure ORTH is always attrs[0] self.tokens = [] self.spaces = [] self.cats = [] self.user_data = [] self.strings = set() self.store_user_data = store_user_data def __len__(self): """RETURNS: The number of Doc objects added to the DocBin.""" return len(self.tokens) def add(self, doc): """Add a Doc's annotations to the DocBin for serialization. doc (Doc): The Doc object to add. DOCS: https://spacy.io/api/docbin#add """ array = doc.to_array(self.attrs) if len(array.shape) == 1: array = array.reshape((array.shape[0], 1)) self.tokens.append(array) spaces = doc.to_array(SPACY) assert array.shape[0] == spaces.shape[0] # this should never happen spaces = spaces.reshape((spaces.shape[0], 1)) self.spaces.append(numpy.asarray(spaces, dtype=bool)) self.strings.update(w.text for w in doc) self.cats.append(doc.cats) if self.store_user_data: self.user_data.append(srsly.msgpack_dumps(doc.user_data)) def get_docs(self, vocab): """Recover Doc objects from the annotations, using the given vocab. vocab (Vocab): The shared vocab. YIELDS (Doc): The Doc objects. DOCS: https://spacy.io/api/docbin#get_docs """ for string in self.strings: vocab[string] orth_col = self.attrs.index(ORTH) for i in range(len(self.tokens)): tokens = self.tokens[i] spaces = self.spaces[i] words = [vocab.strings[orth] for orth in tokens[:, orth_col]] doc = Doc(vocab, words=words, spaces=spaces) doc = doc.from_array(self.attrs, tokens) doc.cats = self.cats[i] if self.store_user_data: user_data = srsly.msgpack_loads(self.user_data[i], use_list=False) doc.user_data.update(user_data) yield doc def merge(self, other): """Extend the annotations of this DocBin with the annotations from another. Will raise an error if the pre-defined attrs of the two DocBins don't match. other (DocBin): The DocBin to merge into the current bin. DOCS: https://spacy.io/api/docbin#merge """ if self.attrs != other.attrs: raise ValueError(Errors.E166.format(current=self.attrs, other=other.attrs)) self.tokens.extend(other.tokens) self.spaces.extend(other.spaces) self.strings.update(other.strings) self.cats.extend(other.cats) if self.store_user_data: self.user_data.extend(other.user_data) def to_bytes(self): """Serialize the DocBin's annotations to a bytestring. RETURNS (bytes): The serialized DocBin. DOCS: https://spacy.io/api/docbin#to_bytes """ for tokens in self.tokens: assert len(tokens.shape) == 2, tokens.shape # this should never happen lengths = [len(tokens) for tokens in self.tokens] msg = { "attrs": self.attrs, "tokens": numpy.vstack(self.tokens).tobytes("C"), "spaces": numpy.vstack(self.spaces).tobytes("C"), "lengths": numpy.asarray(lengths, dtype="int32").tobytes("C"), "strings": list(self.strings), "cats": self.cats, } if self.store_user_data: msg["user_data"] = self.user_data return zlib.compress(srsly.msgpack_dumps(msg)) def from_bytes(self, bytes_data): """Deserialize the DocBin's annotations from a bytestring. bytes_data (bytes): The data to load from. RETURNS (DocBin): The loaded DocBin. DOCS: https://spacy.io/api/docbin#from_bytes """ msg = srsly.msgpack_loads(zlib.decompress(bytes_data)) self.attrs = msg["attrs"] self.strings = set(msg["strings"]) lengths = numpy.frombuffer(msg["lengths"], dtype="int32") flat_spaces = numpy.frombuffer(msg["spaces"], dtype=bool) flat_tokens = numpy.frombuffer(msg["tokens"], dtype="uint64") shape = (flat_tokens.size // len(self.attrs), len(self.attrs)) flat_tokens = flat_tokens.reshape(shape) flat_spaces = flat_spaces.reshape((flat_spaces.size, 1)) self.tokens = NumpyOps().unflatten(flat_tokens, lengths) self.spaces = NumpyOps().unflatten(flat_spaces, lengths) self.cats = msg["cats"] if self.store_user_data and "user_data" in msg: self.user_data = list(msg["user_data"]) for tokens in self.tokens: assert len(tokens.shape) == 2, tokens.shape # this should never happen return self def merge_bins(bins): merged = None for byte_string in bins: if byte_string is not None: doc_bin = DocBin(store_user_data=True).from_bytes(byte_string) if merged is None: merged = doc_bin else: merged.merge(doc_bin) if merged is not None: return merged.to_bytes() else: return b"" def pickle_bin(doc_bin): return (unpickle_bin, (doc_bin.to_bytes(),)) def unpickle_bin(byte_string): return DocBin().from_bytes(byte_string) copy_reg.pickle(DocBin, pickle_bin, unpickle_bin) # Compatibility, as we had named it this previously. Binder = DocBin __all__ = ["DocBin"]