Add some quantized functions to pyo3. (#708)

candle-pyo3/src/lib.rs

@@ -2,7 +2,8 @@
 // TODO: Handle negative dimension indexes.
 use pyo3::exceptions::{PyTypeError, PyValueError};
 use pyo3::prelude::*;
-use pyo3::types::PyTuple;
+use pyo3::types::{IntoPyDict, PyTuple};
+use pyo3::ToPyObject;
 use std::sync::Arc;
 
 use half::{bf16, f16};
@@ -583,6 +584,45 @@ impl PyQTensor {
     }
 }
 
+#[pyfunction]
+fn load_safetensors(path: &str, py: Python<'_>) -> PyResult<PyObject> {
+    let res = ::candle::safetensors::load(path, &Device::Cpu).map_err(wrap_err)?;
+    let res = res
+        .into_iter()
+        .map(|(key, value)| (key, PyTensor(value).into_py(py)))
+        .collect::<Vec<_>>();
+    Ok(res.into_py_dict(py).to_object(py))
+}
+
+#[pyfunction]
+fn load_ggml(path: &str, py: Python<'_>) -> PyResult<PyObject> {
+    let mut file = std::fs::File::open(path)?;
+    let ggml = ::candle::quantized::ggml_file::Content::read(&mut file).map_err(wrap_err)?;
+    let res = ggml
+        .tensors
+        .into_iter()
+        .map(|(key, qtensor)| Ok((key, PyQTensor(Arc::new(qtensor)).into_py(py))))
+        .collect::<::candle::Result<Vec<_>>>()
+        .map_err(wrap_err)?;
+    Ok(res.into_py_dict(py).to_object(py))
+}
+
+#[pyfunction]
+fn load_gguf(path: &str, py: Python<'_>) -> PyResult<PyObject> {
+    let mut file = std::fs::File::open(path)?;
+    let gguf = ::candle::quantized::gguf_file::Content::read(&mut file).map_err(wrap_err)?;
+    let res = gguf
+        .tensor_infos
+        .keys()
+        .map(|key| {
+            let qtensor = gguf.tensor(&mut file, key)?;
+            Ok((key, PyQTensor(Arc::new(qtensor)).into_py(py)))
+        })
+        .collect::<::candle::Result<Vec<_>>>()
+        .map_err(wrap_err)?;
+    Ok(res.into_py_dict(py).to_object(py))
+}
+
 #[pyfunction]
 fn cuda_is_available() -> bool {
     ::candle::utils::cuda_is_available()
@@ -627,6 +667,9 @@ fn candle(py: Python<'_>, m: &PyModule) -> PyResult<()> {
     m.add("f32", PyDType(DType::F32))?;
     m.add("f64", PyDType(DType::F64))?;
     m.add_function(wrap_pyfunction!(cat, m)?)?;
+    m.add_function(wrap_pyfunction!(load_ggml, m)?)?;
+    m.add_function(wrap_pyfunction!(load_gguf, m)?)?;
+    m.add_function(wrap_pyfunction!(load_safetensors, m)?)?;
     m.add_function(wrap_pyfunction!(ones, m)?)?;
     m.add_function(wrap_pyfunction!(rand, m)?)?;
     m.add_function(wrap_pyfunction!(randn, m)?)?;