请问，是什么原因出现这个报错呢？

遇到报错：
ValueError: Found array with 0 sample(s) (shape=(0, 3)) while a minimum of 1 is required.

报错部分的代码

    if ensure_min_samples > 0:
        n_samples = _num_samples(array)
        if n_samples < ensure_min_samples:
            raise ValueError(
                "Found array with %d sample(s) (shape=%s) while a"
                " minimum of %d is required%s."
                % (n_samples, array.shape, ensure_min_samples, context)     #这里报错
            )

    if ensure_min_features > 0 and array.ndim == 2:
        n_features = array.shape[1]
        if n_features < ensure_min_features:
            raise ValueError(
                "Found array with %d feature(s) (shape=%s) while"
                " a minimum of %d is required%s."
                % (n_features, array.shape, ensure_min_features, context)
            )

    if copy and np.may_share_memory(array, array_orig):
        array = np.array(array, dtype=dtype, order=order)

    return array

请问，是什么原因出现这个报错呢？

n_samples = _num_samples(array)这里得出的n_samples是不是0？