| 366 | /// content of the encoded symbol under the employed entropy model). |
| 367 | #[pyo3(signature = (symbols, model, *optional_model_params))] |
| 368 | pub fn encode_reverse( |
| 369 | &mut self, |
| 370 | py: Python<'_>, |
| 371 | symbols: &Bound<'_, PyAny>, |
| 372 | model: &Model, |
| 373 | optional_model_params: &Bound<'_, PyTuple>, |
| 374 | ) -> PyResult<()> { |
| 375 | if let Ok(symbol) = symbols.extract::<i32>() { |
| 376 | if !optional_model_params.is_empty() { |
| 377 | return Err(pyo3::exceptions::PyValueError::new_err( |
| 378 | "To encode a single symbol, use a concrete model, i.e., pass the\n\ |
| 379 | model parameters directly to the constructor of the model and not to the\n\ |
| 380 | `encode` method of the entropy coder. Delaying the specification of model\n\ |
| 381 | parameters until calling `encode_reverse` is only useful if you want to encode |
| 382 | several symbols in a row with individual model parameters for each symbol. If\n\ |
| 383 | this is what you're trying to do then the `symbols` argument should be a numpy\n\ |
| 384 | array, not a scalar.", |
| 385 | )); |
| 386 | } |
| 387 | return model.0.as_parameterized(py, &mut |model| { |
| 388 | self.inner |
| 389 | .encode_symbol(symbol, EncoderDecoderModel(model))?; |
| 390 | Ok(()) |
| 391 | }); |
| 392 | } |
| 393 | |
| 394 | // Don't use an `else` branch here because, if the following `extract` fails, the returned |
| 395 | // error message is actually pretty user friendly. |
| 396 | let symbols = symbols.extract::<PyReadonlyArray1<'_, i32>>()?; |
| 397 | let symbols = symbols.as_array(); |
| 398 | |
| 399 | if optional_model_params.is_empty() { |
| 400 | model.0.as_parameterized(py, &mut |model| { |
| 401 | self.inner |
| 402 | .encode_iid_symbols_reverse(symbols, EncoderDecoderModel(model))?; |
| 403 | Ok(()) |
| 404 | })?; |
| 405 | } else { |
| 406 | if symbols.len() |
| 407 | != model.0.len( |
| 408 | optional_model_params |
| 409 | .get_borrowed_item(0) |
| 410 | .expect("len checked above"), |
| 411 | )? |
| 412 | { |
| 413 | return Err(pyo3::exceptions::PyValueError::new_err( |
| 414 | "`symbols` argument has wrong length.", |
| 415 | )); |
| 416 | } |
| 417 | let mut symbol_iter = symbols.iter().rev(); |
| 418 | model |
| 419 | .0 |
| 420 | .parameterize(py, optional_model_params, true, &mut |model| { |
| 421 | let symbol = symbol_iter.next().expect("TODO"); |
| 422 | self.inner |
| 423 | .encode_symbol(*symbol, EncoderDecoderModel(model))?; |
| 424 | Ok(()) |
| 425 | })?; |