add deduplication to preprocessing

preprocessing.py

@@ -1,6 +1,14 @@
 from tqdm import tqdm
 from datasets import load_dataset, Dataset
 
+import hashlib
+import re
+import time
+from datasets import load_dataset
+
+
+PATTERN = re.compile(r"\s+")
+
 def parse_data(ds):
     """Parse data into markdown-code pairs"""
     markdowns = []
@@ -40,10 +48,45 @@ def parse_data(ds):
         licenses.extend([license] * len(inner_markdowns))
     return markdowns, code_snippets, paths, repo_names, licenses
 
+
+def get_hash(example):
+    """Get hash of content field."""
+    text = example["markdown"] + example["code"]
+    return {"hash": hashlib.md5(re.sub(PATTERN, "", text).encode("utf-8")).hexdigest()}
+
+def preprocess(example):
+    """Chain all preprocessing steps into one function to not fill cache."""
+    results = dict()
+    results.update(get_hash(example))
+    return results
+
+def check_uniques(example, uniques):
+    """Check if current hash is still in set of unique hashes and remove if true."""
+    if example["hash"] in uniques:
+        uniques.remove(example["hash"])
+        return True
+    else:
+        return False
+
+def filter(example, uniques):
+    if not check_uniques(example, uniques):
+        return False
+    else:
+        return True
+
 if __name__ == "__main__":
     ds = load_dataset("codeparrot/github-jupyter-parsed", split="train")
     print("Parsing data...")
     markdowns, code_snippets, paths, repo_names, licenses = parse_data(ds)
     data = {"markdown": markdowns, "code": code_snippets, "path": paths, "repo_name": repo_names, "license": licenses}
     parsed_data = Dataset.from_dict(data)
-    parsed_data.push_to_hub("codeparrot/github-markdown-to-code")
+
+    print("Deduplication...")
+    parsed_data = parsed_data.map(preprocess)
+    # Deduplicate hashes
+    uniques = set(parsed_data.unique("hash"))
+    frac = len(uniques) / len(parsed_data)
+    print(f"Fraction of duplicates: {1-frac:.2%}")
+    ds_filter = parsed_data.filter(filter, fn_kwargs={"uniques": uniques})
+
+    ds_filter.push_to_hub("codeparrot/github-jupyter-text-code-pairs")