download spacy model if not present

normalizers.py

@@ -158,9 +158,16 @@ class TrueCaser:
 
     def __init__(self, backend="spacy"):
         if backend == "spacy":
-            import spacy
+            spacy_model = "en_core_web_sm"
+            try:
+                import spacy
+                self.nlp = spacy.load(spacy_model)
+            except:
+                import spacy.cli
+                spacy.cli.download(spacy_model)
+                import spacy
+                self.nlp = spacy.load(spacy_model)
 
-            self.nlp = spacy.load("en_core_web_sm")
             self.normalize_fn = self._spacy_truecasing
         else:
             from nltk import pos_tag, word_tokenize  # noqa