add prefix_suffix_writer

Change-Id: I2a6bf1d675b60d7862726f922c6f0c13836d0124

src/jax_loop_utils/metric_writers/__init__.py

@@ -48,7 +48,9 @@
 from jax_loop_utils.metric_writers.interface import MetricWriter
 from jax_loop_utils.metric_writers.keep_last_writer import KeepLastWriter
 from jax_loop_utils.metric_writers.logging_writer import LoggingWriter
+from jax_loop_utils.metric_writers.memory_writer import MemoryWriter
 from jax_loop_utils.metric_writers.multi_writer import MultiWriter
+from jax_loop_utils.metric_writers.prefix_suffix_writer import PrefixSuffixWriter
 from jax_loop_utils.metric_writers.utils import write_values
 
 # TODO(b/200953513): Migrate away from logging imports (on module level)
@@ -60,7 +62,9 @@
     "ensure_flushes",
     "KeepLastWriter",
     "LoggingWriter",
+    "MemoryWriter",
     "MetricWriter",
     "MultiWriter",
+    "PrefixSuffixWriter",
     "write_values",
 ]

src/jax_loop_utils/metric_writers/prefix_suffix_writer.py

@@ -0,0 +1,70 @@
+"""Writer that adds prefix and suffix to metric keys."""
+
+from typing import Any, Mapping, Optional
+
+from jax_loop_utils.metric_writers import interface
+
+
+class PrefixSuffixWriter(interface.MetricWriter):
+    """Wraps a MetricWriter and adds prefix/suffix to all keys."""
+
+    def __init__(
+        self,
+        writer: interface.MetricWriter,
+        prefix: str = "",
+        suffix: str = "",
+    ):
+        """Initialize the writer.
+
+        Args:
+            writer: The underlying MetricWriter to wrap
+            prefix: String to prepend to all keys
+            suffix: String to append to all keys
+        """
+        self._writer = writer
+        self._prefix = prefix
+        self._suffix = suffix
+
+    def _transform_keys(self, data: Mapping[str, Any]) -> dict[str, Any]:
+        """Add prefix and suffix to all keys in the mapping."""
+        return {
+            f"{self._prefix}{key}{self._suffix}": value for key, value in data.items()
+        }
+
+    def write_scalars(self, step: int, scalars: Mapping[str, interface.Scalar]):
+        self._writer.write_scalars(step, self._transform_keys(scalars))
+
+    def write_images(self, step: int, images: Mapping[str, interface.Array]):
+        self._writer.write_images(step, self._transform_keys(images))
+
+    def write_videos(self, step: int, videos: Mapping[str, interface.Array]):
+        self._writer.write_videos(step, self._transform_keys(videos))
+
+    def write_audios(
+        self, step: int, audios: Mapping[str, interface.Array], *, sample_rate: int
+    ):
+        self._writer.write_audios(
+            step, self._transform_keys(audios), sample_rate=sample_rate
+        )
+
+    def write_texts(self, step: int, texts: Mapping[str, str]):
+        self._writer.write_texts(step, self._transform_keys(texts))
+
+    def write_histograms(
+        self,
+        step: int,
+        arrays: Mapping[str, interface.Array],
+        num_buckets: Optional[Mapping[str, int]] = None,
+    ):
+        if num_buckets is not None:
+            num_buckets = self._transform_keys(num_buckets)
+        self._writer.write_histograms(step, self._transform_keys(arrays), num_buckets)
+
+    def write_hparams(self, hparams: Mapping[str, Any]):
+        self._writer.write_hparams(self._transform_keys(hparams))
+
+    def flush(self):
+        self._writer.flush()
+
+    def close(self):
+        self._writer.close()

src/jax_loop_utils/metric_writers/prefix_suffix_writer_test.py

@@ -0,0 +1,68 @@
+"""Tests for PrefixSuffixWriter."""
+
+import numpy as np
+from absl.testing import absltest
+
+from jax_loop_utils.metric_writers import memory_writer, prefix_suffix_writer
+
+
+class PrefixSuffixWriterTest(absltest.TestCase):
+    def setUp(self):
+        super().setUp()
+        self.memory_writer = memory_writer.MemoryWriter()
+        self.writer = prefix_suffix_writer.PrefixSuffixWriter(
+            self.memory_writer,
+            prefix="prefix/",
+            suffix="/suffix",
+        )
+
+    def test_write_scalars(self):
+        self.writer.write_scalars(0, {"metric": 1.0})
+        self.assertEqual(self.memory_writer.scalars, {0: {"prefix/metric/suffix": 1.0}})
+
+    def test_write_images(self):
+        image = np.zeros((2, 2, 3))
+        self.writer.write_images(0, {"image": image})
+        self.assertEqual(
+            list(self.memory_writer.images[0].keys()), ["prefix/image/suffix"]
+        )
+
+    def test_write_texts(self):
+        self.writer.write_texts(0, {"text": "hello"})
+        self.assertEqual(self.memory_writer.texts, {0: {"prefix/text/suffix": "hello"}})
+
+    def test_write_histograms(self):
+        data = np.array([1, 2, 3])
+        buckets = {"hist": 10}
+        self.writer.write_histograms(0, {"hist": data}, buckets)
+        self.assertEqual(
+            list(self.memory_writer.histograms[0].arrays.keys()),
+            ["prefix/hist/suffix"],
+        )
+
+    def test_write_hparams(self):
+        self.writer.write_hparams({"param": 1})
+        self.assertEqual(self.memory_writer.hparams, {"prefix/param/suffix": 1})
+
+    def test_empty_prefix_suffix(self):
+        writer = prefix_suffix_writer.PrefixSuffixWriter(self.memory_writer)
+        writer.write_scalars(0, {"metric": 1.0})
+        self.assertEqual(self.memory_writer.scalars, {0: {"metric": 1.0}})
+
+    def test_write_videos(self):
+        video = np.zeros((10, 32, 32, 3))  # Simple video array with 10 frames
+        self.writer.write_videos(0, {"video": video})
+        self.assertEqual(
+            list(self.memory_writer.videos[0].keys()), ["prefix/video/suffix"]
+        )
+
+    def test_write_audios(self):
+        audio = np.zeros((16000,))  # 1 second of audio at 16kHz
+        self.writer.write_audios(0, {"audio": audio}, sample_rate=16000)
+        self.assertEqual(
+            list(self.memory_writer.audios[0].audios.keys()), ["prefix/audio/suffix"]
+        )
+
+
+if __name__ == "__main__":
+    absltest.main()