tests/test_processor.py

from __future__ import annotations

import numpy as np
from PIL import Image

from processing_htr import HTRProcessor


def test_preprocess_shape_stride_alignment() -> None:
    processor = HTRProcessor(characters=["а", "б", "в"], image_height=64, image_max_width=256, width_stride=32)
    img = Image.fromarray((np.random.rand(53, 117) * 255).astype(np.uint8))
    out = processor(images=img, return_tensors="np")["pixel_values"]
    assert out.shape[0] == 1
    assert out.shape[1] == 1
    assert out.shape[2] == 64
    assert out.shape[3] % 32 == 0


def test_ctc_batch_decode() -> None:
    processor = HTRProcessor(characters=["а", "б", "в"], image_height=64, image_max_width=256, width_stride=32)
    logits = np.array(
        [
            [[0.1, 0.9, 0.0, 0.0], [0.1, 0.0, 0.9, 0.0]],
            [[0.1, 0.9, 0.0, 0.0], [0.1, 0.0, 0.9, 0.0]],
            [[0.9, 0.0, 0.0, 0.0], [0.9, 0.0, 0.0, 0.0]],
        ],
        dtype=np.float32,
    )  # T,N,C
    texts = processor.batch_decode(logits, logit_layout="tnc")
    assert texts == ["а", "б"]