bug fix

scripts/to_parquet.py

@@ -1,19 +1,27 @@
+import os
 import pandas as pd
 from datasets import Dataset, Image
-import os
 
 
 df = pd.read_json("data/metadata.jsonl", lines=True)
 
 
-def full_path(path):
-    return os.path.join(os.getcwd(),"data", path)
+df['image'] = df['file_name'].apply(lambda x: os.path.join(os.getcwd(), "data", x))
 
-df['image'] = df['file_name'].apply(full_path)
+ds = Dataset.from_pandas(df)
+
+# 3. Define the transformation and trigger the read.
+def load_image_bytes(example):
+    # No operation is required here, but the map process will trigger encoding and decoding of the Image() type.
+    # Force the path to be converted to in-memory image data.
+    return {"image": example["image"]}
 
 
-ds = Dataset.from_pandas(df)
 ds = ds.cast_column("image", Image())
 
+ds = ds.map(load_image_bytes, num_proc=1) 
+
+
+print(f"first entry: {ds[0]}")
 
 ds.to_parquet("violin-test.parquet", batch_size=10000)

violin-test.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:2157037818cb9b4f0292113da2e93f8c66d0fc4ca4a6c0b74b9d65e74e761a5d
-size 1981815
+oid sha256:399d0a9956f159293e8027e28d76e873df3e7091839c5cb94b1d54aee0f5bd99
+size 1981175