| 528 | /// ``` |
| 529 | #[pyo3(signature = (symbols, model, *optional_model_params))] |
| 530 | pub fn encode_reverse( |
| 531 | &mut self, |
| 532 | py: Python<'_>, |
| 533 | symbols: &Bound<'_, PyAny>, |
| 534 | model: &Model, |
| 535 | optional_model_params: &Bound<'_, PyTuple>, |
| 536 | ) -> PyResult<()> { |
| 537 | if let Ok(symbol) = symbols.extract::<i32>() { |
| 538 | if !optional_model_params.is_empty() { |
| 539 | return Err(pyo3::exceptions::PyValueError::new_err( |
| 540 | "To encode a single symbol, use a concrete model, i.e., pass the\n\ |
| 541 | model parameters directly to the constructor of the model and not to the\n\ |
| 542 | `encode` method of the entropy coder. Delaying the specification of model\n\ |
| 543 | parameters until calling `encode_reverse` is only useful if you want to encode |
| 544 | several symbols in a row with individual model parameters for each symbol. If\n\ |
| 545 | this is what you're trying to do then the `symbols` argument should be a numpy\n\ |
| 546 | array, not a scalar.", |
| 547 | )); |
| 548 | } |
| 549 | return model.0.as_parameterized(py, &mut |model| { |
| 550 | self.inner |
| 551 | .encode_symbol(symbol, EncoderDecoderModel(model))?; |
| 552 | Ok(()) |
| 553 | }); |
| 554 | } |
| 555 | |
| 556 | // Don't use an `else` branch here because, if the following `extract` fails, the returned |
| 557 | // error message is actually pretty user friendly. |
| 558 | let symbols = symbols.extract::<PyReadonlyArray1<'_, i32>>()?; |
| 559 | let symbols = symbols.as_array(); |
| 560 | |
| 561 | if optional_model_params.is_empty() { |
| 562 | model.0.as_parameterized(py, &mut |model| { |
| 563 | self.inner |
| 564 | .encode_iid_symbols_reverse(symbols, EncoderDecoderModel(model))?; |
| 565 | Ok(()) |
| 566 | })?; |
| 567 | } else { |
| 568 | if symbols.len() |
| 569 | != model.0.len( |
| 570 | optional_model_params |
| 571 | .get_borrowed_item(0) |
| 572 | .expect("len checked above"), |
| 573 | )? |
| 574 | { |
| 575 | return Err(pyo3::exceptions::PyValueError::new_err( |
| 576 | "`symbols` argument has wrong length.", |
| 577 | )); |
| 578 | } |
| 579 | let mut symbol_iter = symbols.iter().rev(); |
| 580 | model |
| 581 | .0 |
| 582 | .parameterize(py, optional_model_params, true, &mut |model| { |
| 583 | let symbol = symbol_iter.next().expect("TODO"); |
| 584 | self.inner |
| 585 | .encode_symbol(*symbol, EncoderDecoderModel(model))?; |
| 586 | Ok(()) |
| 587 | })?; |