def test_set_obsm(adata):
    init_hash = joblib.hash(adata)

    dim0_size = np.random.randint(2, adata.shape[0] - 1)
    dim1_size = np.random.randint(1, 99)
    orig_obsm_val = adata.obsm["o"].copy()
    subset_idx = np.random.choice(adata.obs_names, dim0_size, replace=False)

    subset = adata[subset_idx, :]
    assert subset.is_view
    subset.obsm = dict(o=np.ones((dim0_size, dim1_size)))
    assert not subset.is_view
    assert np.all(orig_obsm_val == adata.obsm["o"])  # Checking for mutation
    assert np.all(subset.obsm["o"] == np.ones((dim0_size, dim1_size)))

    subset = adata[subset_idx, :]
    subset_hash = joblib.hash(subset)
    with pytest.raises(ValueError):
        subset.obsm = dict(o=np.ones((dim0_size + 1, dim1_size)))
    with pytest.raises(ValueError):
        subset.varm = dict(o=np.ones((dim0_size - 1, dim1_size)))
    assert subset_hash == joblib.hash(subset)

    # Only modification have been made to a view
    assert init_hash == joblib.hash(adata)
def log_exception(cls, msg):
        """Try to log an error message to this process's error log and the shared error log.

        NB: Doesn't raise (logs an error instead).
        """
        pid = os.getpid()
        fatal_error_log_entry = cls._format_exception_message(msg, pid)

        # We care more about this log than the shared log, so write to it first.
        try:
            cls._try_write_with_flush(cls._pid_specific_error_fileobj, fatal_error_log_entry)
        except Exception as e:
            logger.error(
                "Error logging the message '{}' to the pid-specific file handle for {} at pid {}:\n{}".format(
                    msg, cls._log_dir, pid, e
                )
            )

        # Write to the shared log.
        try:
            # TODO: we should probably guard this against concurrent modification by other pants
            # subprocesses somehow.
            cls._try_write_with_flush(cls._shared_error_fileobj, fatal_error_log_entry)
        except Exception as e:
            logger.error(
                "Error logging the message '{}' to the shared file handle for {} at pid {}:\n{}".format(
                    msg, cls._log_dir, pid, e
                )
            )