Add support for pretrained tok2vec to ud-train

spacy/cli/ud_train.py

@@ -305,10 +305,28 @@ def initialize_pipeline(nlp, docs, golds, config, device):
                 nlp.tagger.add_label(tag)
     if torch is not None and device != -1:
         torch.set_default_tensor_type('torch.cuda.FloatTensor')
-    return nlp.begin_training(
+    optimizer = nlp.begin_training(
         lambda: golds_to_gold_tuples(docs, golds), device=device,
         subword_features=config.subword_features, conv_depth=config.conv_depth,
         bilstm_depth=config.bilstm_depth)
+    if config.pretrained_tok2vec:
+        _load_pretrained_tok2vec(nlp, config.pretrained_tok2vec)
+    return optimizer
+
+
+def _load_pretrained_tok2vec(nlp, loc):
+    """Load pre-trained weights for the 'token-to-vector' part of the component
+    models, which is typically a CNN. See 'spacy pretrain'. Experimental.
+    """
+    with Path(loc).open('rb') as file_:
+        weights_data = file_.read()
+    loaded = []
+    for name, component in nlp.pipeline:
+        if hasattr(component, 'model') and hasattr(component.model, 'tok2vec'):
+            component.tok2vec.from_bytes(weights_data)
+            loaded.append(name)
+    return loaded
+
 
 
 ########################
@@ -318,9 +336,9 @@ def initialize_pipeline(nlp, docs, golds, config, device):
 class Config(object):
     def __init__(self, vectors=None, max_doc_length=10, multitask_tag=False,
                 multitask_sent=False, multitask_dep=False, multitask_vectors=None,
-                bilstm_depth=0, nr_epoch=30, min_batch_size=100, max_batch_size=1000,
-                batch_by_words=True, dropout=0.2, conv_depth=4, subword_features=True,
-                vectors_dir=None):
+                bilstm_depth=0, nr_epoch=30, min_batch_size=750, max_batch_size=750,
+                batch_by_words=True, dropout=0.1, conv_depth=4, subword_features=True,
+                vectors_dir=None, pretrained_tok2vec=None):
         if vectors_dir is not None:
             if vectors is None:
                 vectors = True