mirror of
https://github.com/twitter/the-algorithm-ml.git
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88 lines
2.5 KiB
Python
88 lines
2.5 KiB
Python
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"""Reader utilities."""
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import itertools
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import time
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from typing import Optional
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from tml.common.batch import DataclassBatch
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from tml.ml_logging.torch_logging import logging
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import pyarrow as pa
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import torch
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def roundrobin(*iterables):
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"""Round robin through provided iterables, useful for simple load balancing.
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Adapted from https://docs.python.org/3/library/itertools.html.
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"""
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num_active = len(iterables)
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nexts = itertools.cycle(iter(it).__next__ for it in iterables)
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while num_active:
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try:
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for _next in nexts:
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result = _next()
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yield result
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except StopIteration:
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# Remove the iterator we just exhausted from the cycle.
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num_active -= 1
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nexts = itertools.cycle(itertools.islice(nexts, num_active))
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logging.warning(f"Iterable exhausted, {num_active} iterables left.")
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except Exception as exc:
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logging.warning(f"Iterable raised exception {exc}, ignoring.")
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# continue
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raise
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def speed_check(data_loader, max_steps: int, frequency: int, peek: Optional[int]):
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num_examples = 0
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prev = time.perf_counter()
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for idx, batch in enumerate(data_loader):
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if idx > max_steps:
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break
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if peek and idx % peek == 0:
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logging.info(f"Batch: {batch}")
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num_examples += batch.batch_size
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if idx % frequency == 0:
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now = time.perf_counter()
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elapsed = now - prev
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logging.info(
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f"step: {idx}, "
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f"elapsed(s): {elapsed}, "
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f"examples: {num_examples}, "
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f"ex/s: {num_examples / elapsed}, "
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)
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prev = now
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num_examples = 0
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def pa_to_torch(array: pa.array) -> torch.Tensor:
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return torch.from_numpy(array.to_numpy())
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def create_default_pa_to_batch(schema) -> DataclassBatch:
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""" """
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_CustomBatch = DataclassBatch.from_schema("DefaultBatch", schema=schema)
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def get_imputation_value(pa_type):
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type_map = {
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pa.float64(): pa.scalar(0, type=pa.float64()),
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pa.int64(): pa.scalar(0, type=pa.int64()),
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pa.string(): pa.scalar("", type=pa.string()),
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}
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if pa_type not in type_map:
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raise Exception(f"Imputation for type {pa_type} not supported.")
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return type_map[pa_type]
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def _impute(array: pa.array) -> pa.array:
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return array.fill_null(get_imputation_value(array.type))
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def _column_to_tensor(record_batch: pa.RecordBatch):
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tensors = {
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col_name: pa_to_torch(_impute(record_batch.column(col_name)))
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for col_name in record_batch.schema.names
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}
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return _CustomBatch(**tensors)
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return _column_to_tensor
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