diff --git a/examples/inspect.rs b/examples/inspect.rs
index 03b2300..1298911 100644
--- a/examples/inspect.rs
+++ b/examples/inspect.rs
@@ -10,6 +10,10 @@ pub struct Cli {
     power: PowerMode,
     #[clap(short, long, default_value = "high")]
     precision: PrecisionMode,
+    #[clap(short, long, default_value = "high")]
+    memory: MemoryMode,
+    #[clap(short, long, default_value = "1")]
+    loops: usize,
 }
 
 macro_rules! time {
@@ -30,40 +34,52 @@ macro_rules! time {
 pub fn main() -> anyhow::Result<()> {
     use clap::Parser;
     let cli = Cli::parse();
-    let mut interpreter = Interpreter::from_file(cli.model)?;
+    let mut interpreter = Interpreter::from_file(&cli.model)?;
+    interpreter.set_cache_file(cli.model.with_extension("cache"), 128)?;
 
     let mut config = ScheduleConfig::new();
     config.set_type(cli.forward);
-    let mut backend_config = BackendConfig::new();
-    backend_config.set_precision_mode(PrecisionMode::High);
-    backend_config.set_power_mode(PowerMode::High);
-
-    config.set_backend_config(backend_config);
+    // let mut backend_config = BackendConfig::new();
+    // backend_config.set_precision_mode(PrecisionMode::High);
+    // backend_config.set_power_mode(PowerMode::High);
+    // config.set_backend_config(backend_config);
     // let handle = mnn::sync::SessionHandle::new(interpreter, config)?;
-    let session = time!(interpreter.create_session(config)?; "create session");
+    let mut session = time!(interpreter.create_session(config)?; "create session");
+    interpreter.update_cache_file(&mut session)?;
+    let mut input = interpreter.input::<f32>(&session, "image")?;
+    let mut shape = input.shape();
+    shape[0] = 512;
+    shape[1] = 512;
+    shape[2] = 3;
+    interpreter.resize_tensor(&mut input, shape);
+    drop(input);
+    interpreter.resize_session(&mut session);
+    // let session = time!(interpreter.create_session(config)?; "create session");
     // handle.run(|sr| {
     //     let interpreter = sr.interpreter();
     //     let session = sr.session();
-    let inputs = interpreter.inputs(&session);
-    inputs.iter().for_each(|x| {
-        let mut tensor = x.tensor::<f32>().expect("No tensor");
-        println!("{}: {:?}", x.name(), tensor.shape());
-        tensor.fill(1.0f32);
-        // let mut cpu_tensor = tensor.create_host_tensor_from_device(false);
-        // cpu_tensor.host_mut().fill(1.0f32);
-        // tensor
-        //     .copy_from_host_tensor(&cpu_tensor)
-        //     .expect("Could not copy tensor");
-    });
-    time!(interpreter.run_session(&session)?;"run session");
-    let outputs = interpreter.outputs(&session);
-    outputs.iter().for_each(|x| {
-        let tensor = x.tensor::<f32>().expect("No tensor");
-        time!(tensor.wait(ffi::MapType::MAP_TENSOR_READ, true); format!("Waiting for tensor: {}", x.name()));
-        println!("{}: {:?}", x.name(), tensor.shape());
-        let _ = tensor.create_host_tensor_from_device(true);
-        // std::fs::write(format!("{}.bin", x.name()), bytemuck::cast_slice(cpu_tensor.host())).expect("Unable to write");
-    });
+    let mut current = 0;
+    time!(loop {
+        let inputs = interpreter.inputs(&session);
+        inputs.iter().for_each(|x| {
+            let mut tensor = x.tensor::<f32>().expect("No tensor");
+            println!("{}: {:?}", x.name(), tensor.shape());
+            tensor.fill(1.0f32);
+        });
+        time!(interpreter.run_session(&session)?;"run session");
+        let outputs = interpreter.outputs(&session);
+        outputs.iter().for_each(|x| {
+            let tensor = x.tensor::<u8>().expect("No tensor");
+            time!(tensor.wait(ffi::MapType::MAP_TENSOR_READ, true); format!("Waiting for tensor: {}", x.name()));
+            println!("{}: {:?}", x.name(), tensor.shape());
+            let _ = tensor.create_host_tensor_from_device(true);
+            // std::fs::write(format!("{}.bin", x.name()), bytemuck::cast_slice(cpu_tensor.host())).expect("Unable to write");
+        });
+        current += 1;
+        if current >= cli.loops {
+            break;
+        }
+    }; "run loop");
     // Ok(())
     // })?;
     Ok(())
diff --git a/mnn-sys/mnn_c/interpreter_c.cpp b/mnn-sys/mnn_c/interpreter_c.cpp
index 6c1bd7f..6bfb0b4 100644
--- a/mnn-sys/mnn_c/interpreter_c.cpp
+++ b/mnn-sys/mnn_c/interpreter_c.cpp
@@ -53,11 +53,10 @@ void Interpreter_setExternalFile(Interpreter *interpreter, const char *file,
   mnn_interpreter->setExternalFile(file, flag);
 }
 ErrorCode Interpreter_updateCacheFile(Interpreter *interpreter,
-                                      Session *session, int flag) {
+                                      Session *session) {
   auto mnn_interpreter = reinterpret_cast<MNN::Interpreter *>(interpreter);
   auto mnn_session = reinterpret_cast<MNN::Session *>(session);
-  return static_cast<ErrorCode>(
-      mnn_interpreter->updateCacheFile(mnn_session, flag));
+  return static_cast<ErrorCode>(mnn_interpreter->updateCacheFile(mnn_session));
 }
 void Interpreter_setSessionHint(Interpreter *interpreter, int mode, int value) {
   auto mnn_interpreter = reinterpret_cast<MNN::Interpreter *>(interpreter);
@@ -111,17 +110,36 @@ Session *Interpreter_createSession(Interpreter *interpreter,
 //     cppConfig.backendConfig = config->backendConfig;
 //     return interpreter->createSession(cppConfig, *runtime);
 // }
-Session *Interpreter_createMultiPathSession(Interpreter *interpreter,
-                                            const MNNScheduleConfig *configs,
-                                            size_t configSize) {
-
-  auto mnn_configs = reinterpret_cast<const MNN::ScheduleConfig *>(configs);
-  // @todo: check if this is correct
-  std::vector<MNN::ScheduleConfig> cppConfigs(mnn_configs,
-                                              mnn_configs + configSize);
+// Session *Interpreter_createMultiPathSession(Interpreter *interpreter,
+//                                             const MNNScheduleConfig *configs,
+//                                             size_t configSize) {
+//
+//   auto mnn_configs = reinterpret_cast<const MNN::ScheduleConfig *>(configs);
+//   std::vector<MNN::ScheduleConfig> cppConfigs(mnn_configs,
+//                                               mnn_configs + configSize);
+//   auto mnn_interpreter = reinterpret_cast<MNN::Interpreter *>(interpreter);
+//   return reinterpret_cast<Session *>(
+//       mnn_interpreter->createMultiPathSession(cppConfigs));
+// }
+Session *
+Interpreter_createMultiPathSession(Interpreter *interpreter,
+                                   const MNNScheduleConfig *const *configs,
+                                   size_t configSize) {
+  auto mnn_configs =
+      reinterpret_cast<const MNN::ScheduleConfig *const *>(configs);
+  std::vector<MNN::ScheduleConfig> s_configs;
+  for (size_t i = 0; i < configSize; ++i) {
+    s_configs.push_back(*mnn_configs[i]);
+  }
+  // std::vector<MNN::ScheduleConfig *> cppConfigs(mnn_configs,
+  //                                               mnn_configs + configSize);
+  // Create a std::vector<MMN::ScheduleConfig> from
+  // std::vector<MNN::ScheduleConfig *>
+  // auto s_configs =
+  //     std::vector<MNN::ScheduleConfig>(cppConfigs.begin(), cppConfigs.end());
   auto mnn_interpreter = reinterpret_cast<MNN::Interpreter *>(interpreter);
-  return reinterpret_cast<Session *>(
-      mnn_interpreter->createMultiPathSession(cppConfigs));
+  MNN::Session *session = mnn_interpreter->createMultiPathSession(s_configs);
+  return reinterpret_cast<Session *>(session);
 }
 
 // Session* Interpreter_createMultiPathSessionWithRuntime(Interpreter*
@@ -299,6 +317,6 @@ const char *Interpreter_uuid(const Interpreter *interpreter) {
 }
 void Session_destroy(Session *session) {
   auto mnn_session = reinterpret_cast<MNN::Session *>(session);
-  delete mnn_session;
+  // delete mnn_session;
 }
 } // extern "C"
diff --git a/mnn-sys/mnn_c/interpreter_c.h b/mnn-sys/mnn_c/interpreter_c.h
index 9932edf..a3c1a04 100644
--- a/mnn-sys/mnn_c/interpreter_c.h
+++ b/mnn-sys/mnn_c/interpreter_c.h
@@ -1,8 +1,8 @@
 #ifndef INTERPRETER_C_H
 #define INTERPRETER_C_H
 #include "backend_c.h"
-#include "schedule_c.h"
 #include "error_code_c.h"
+#include "schedule_c.h"
 #include "tensor_c.h"
 #include "utils.h"
 #include <MNN/HalideRuntime.h>
@@ -144,7 +144,7 @@ void Interpreter_setCacheFile(Interpreter *interpreter, const char *cacheFile,
 void Interpreter_setExternalFile(Interpreter *interpreter, const char *file,
                                  size_t flag);
 ErrorCode Interpreter_updateCacheFile(Interpreter *interpreter,
-                                      Session *session, int flag);
+                                      Session *session);
 void Interpreter_setSessionHint(Interpreter *interpreter, int mode, int value);
 // RuntimeInfo *Interpreter_createRuntime(const ScheduleConfig *configs,
 //                                        size_t configSize);
@@ -153,9 +153,10 @@ Session *Interpreter_createSession(Interpreter *interpreter,
 // Session *Interpreter_createSessionWithRuntime(Interpreter *interpreter,
 //                                               const ScheduleConfig *config,
 //                                               const RuntimeInfo *runtime);
-Session *Interpreter_createMultiPathSession(Interpreter *interpreter,
-                                            const MNNScheduleConfig *configs,
-                                            size_t configSize);
+Session *
+Interpreter_createMultiPathSession(Interpreter *interpreter,
+                                   const MNNScheduleConfig *const *configs,
+                                   size_t configSize);
 // Session *Interpreter_createMultiPathSessionWithRuntime(
 //     Interpreter *interpreter, const ScheduleConfig *configs, size_t
 //     configSize, const RuntimeInfo *runtime);
@@ -186,11 +187,13 @@ Tensor *Interpreter_getSessionOutput(Interpreter *interpreter,
                                      const Session *session, const char *name);
 int Interpreter_getSessionInfo(Interpreter *interpreter, const Session *session,
                                int code, void *ptr);
-TensorInfoArray const * Interpreter_getSessionOutputAll(const Interpreter *interpreter,
-                                                const Session *session);
+TensorInfoArray const *
+Interpreter_getSessionOutputAll(const Interpreter *interpreter,
+                                const Session *session);
 
-TensorInfoArray const * Interpreter_getSessionInputAll(const Interpreter *interpreter,
-                                               const Session *session);
+TensorInfoArray const *
+Interpreter_getSessionInputAll(const Interpreter *interpreter,
+                               const Session *session);
 void Interpreter_resizeTensor(Interpreter *interpreter, Tensor *tensor,
                               const int *dims, size_t dimsSize);
 void Interpreter_resizeTensorByNCHW(Interpreter *interpreter, Tensor *tensor,
diff --git a/src/interpreter.rs b/src/interpreter.rs
index 3240191..b1c555d 100644
--- a/src/interpreter.rs
+++ b/src/interpreter.rs
@@ -1,4 +1,6 @@
-use crate::{prelude::*, AsTensorShape, Device, Ref, RefMut, Tensor, TensorType};
+use std::path::Path;
+
+use crate::{prelude::*, AsTensorShape, Device, Ref, RefMut, ScheduleConfig, Tensor, TensorType};
 use mnn_sys::HalideType;
 
 #[derive(Debug, Copy, Clone)]
@@ -59,7 +61,7 @@ pub struct Interpreter {
 unsafe impl Send for Interpreter {}
 
 impl Interpreter {
-    pub fn from_file(path: impl AsRef<std::path::Path>) -> Result<Self> {
+    pub fn from_file(path: impl AsRef<Path>) -> Result<Self> {
         let path = path.as_ref();
         ensure!(path.exists(), ErrorKind::IOError; path.to_string_lossy().to_string());
         let path = path.to_str().ok_or_else(|| error!(ErrorKind::AsciiError))?;
@@ -134,13 +136,30 @@ impl Interpreter {
             assert!(!session.is_null());
             Ok(crate::session::Session {
                 inner: session,
-                __schedule_config: schedule,
+                __session_internals: crate::SessionInternals::Single(schedule),
+                __marker: PhantomData,
+            })
+        })
+    }
+
+    pub fn create_multipath_session(
+        &mut self,
+        schedule: impl IntoIterator<Item = ScheduleConfig>,
+    ) -> Result<crate::session::Session> {
+        profile!("Creating multipath session"; {
+            let schedules: crate::ScheduleConfigs = schedule.into_iter().collect();
+            let sc: &[_] = schedules.inner.as_ref();
+            let session = unsafe { mnn_sys::Interpreter_createMultiPathSession(self.inner, sc.as_ptr(), sc.len()) };
+            assert!(!session.is_null());
+            Ok(crate::session::Session {
+                inner: session,
+                __session_internals: crate::SessionInternals::MultiSession(schedules),
                 __marker: PhantomData,
             })
         })
     }
 
-    pub fn model_print_io(path: impl AsRef<std::path::Path>) -> Result<()> {
+    pub fn model_print_io(path: impl AsRef<Path>) -> Result<()> {
         let path = path.as_ref();
         crate::ensure!(path.exists(), ErrorKind::IOError);
         let path = path.to_str().ok_or_else(|| error!(ErrorKind::AsciiError))?;
@@ -166,8 +185,8 @@ impl Interpreter {
         };
         ensure!(!input.is_null(), ErrorKind::TensorError; format!("Input tensor \"{name}\" not found"));
         let tensor = unsafe { Tensor::from_ptr(input) };
-        let shape = tensor.shape();
-        ensure!(!shape.as_ref().contains(&-1), ErrorKind::DynamicTensorError);
+        // let shape = tensor.shape();
+        // ensure!(!shape.as_ref().contains(&-1), ErrorKind::DynamicTensorError);
         ensure!(
             tensor.is_type_of::<H>(),
             ErrorKind::HalideTypeMismatch {
@@ -203,12 +222,12 @@ impl Interpreter {
 
     pub fn run_session(&self, session: &crate::session::Session) -> Result<()> {
         profile!("Running session"; {
-        let ret = unsafe { mnn_sys::Interpreter_runSession(self.inner, session.inner) };
-        ensure!(
-            ret == mnn_sys::ErrorCode::ERROR_CODE_NO_ERROR,
-            ErrorKind::InternalError(ret)
-        );
-        Ok(())
+            let ret = unsafe { mnn_sys::Interpreter_runSession(self.inner, session.inner) };
+            ensure!(
+                ret == mnn_sys::ErrorCode::ERROR_CODE_NO_ERROR,
+                ErrorKind::InternalError(ret)
+            );
+            Ok(())
         })
     }
 
@@ -217,6 +236,20 @@ impl Interpreter {
             unsafe { mnn_sys::Interpreter_getSessionOutputAll(self.inner, session.inner) };
         TensorList::from_ptr(outputs)
     }
+
+    pub fn set_cache_file(&mut self, path: impl AsRef<Path>, key_size: usize) -> Result<()> {
+        let path = path.as_ref();
+        let path = path.to_str().ok_or_else(|| error!(ErrorKind::AsciiError))?;
+        let c_path = std::ffi::CString::new(path).change_context(ErrorKind::AsciiError)?;
+        unsafe { mnn_sys::Interpreter_setCacheFile(self.inner, c_path.as_ptr(), key_size) }
+        Ok(())
+    }
+    pub fn update_cache_file(&mut self, session: &mut crate::session::Session) -> Result<()> {
+        MNNError::from_error_code(unsafe {
+            mnn_sys::Interpreter_updateCacheFile(self.inner, session.inner)
+        });
+        Ok(())
+    }
 }
 
 #[repr(transparent)]
diff --git a/src/schedule.rs b/src/schedule.rs
index 54b45b2..e7693b7 100644
--- a/src/schedule.rs
+++ b/src/schedule.rs
@@ -1,5 +1,5 @@
 use mnn_sys::*;
-use std::ffi::CString;
+use std::{ffi::CString, mem::ManuallyDrop};
 
 use crate::{prelude::*, BackendConfig};
 
@@ -177,3 +177,59 @@ impl ScheduleConfig {
         }
     }
 }
+
+pub struct ScheduleConfigs {
+    pub(crate) inner: Vec<*const MNNScheduleConfig>,
+    pub(crate) backend_configs: Vec<Option<BackendConfig>>,
+}
+
+impl Drop for ScheduleConfigs {
+    fn drop(&mut self) {
+        unsafe {
+            for i in self.inner.iter() {
+                mnnsc_destroy(*i.cast());
+            }
+        }
+    }
+}
+
+impl ScheduleConfigs {
+    pub fn push(&mut self, config: ScheduleConfig) {
+        let mut config = ManuallyDrop::new(config);
+        self.inner.push(config.inner);
+        self.backend_configs.push(config.backend_config.take());
+    }
+
+    pub fn with_capacity(capacity: usize) -> Self {
+        Self {
+            inner: Vec::with_capacity(capacity),
+            backend_configs: Vec::with_capacity(capacity),
+        }
+    }
+
+    pub const fn new() -> Self {
+        Self {
+            inner: Vec::new(),
+            backend_configs: Vec::new(),
+        }
+    }
+}
+
+impl Default for ScheduleConfigs {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl FromIterator<ScheduleConfig> for ScheduleConfigs {
+    fn from_iter<T: IntoIterator<Item = ScheduleConfig>>(iter: T) -> Self {
+        let iter = iter.into_iter();
+        let mut ret = Self::with_capacity(iter.size_hint().1.unwrap_or_default());
+        iter.for_each(|item| {
+            ret.push(item);
+        });
+        ret
+    }
+}
+
+unsafe impl Send for ScheduleConfigs {}
diff --git a/src/session.rs b/src/session.rs
index 931350c..885f6d2 100644
--- a/src/session.rs
+++ b/src/session.rs
@@ -2,10 +2,15 @@ use crate::prelude::*;
 
 pub struct Session {
     pub(crate) inner: *mut mnn_sys::Session,
-    pub(crate) __schedule_config: crate::ScheduleConfig,
+    pub(crate) __session_internals: crate::SessionInternals,
     pub(crate) __marker: PhantomData<()>,
 }
 
+pub enum SessionInternals {
+    Single(crate::ScheduleConfig),
+    MultiSession(crate::ScheduleConfigs),
+}
+
 impl Session {
     // pub unsafe fn from_ptr(session: *mut mnn_sys::Session) -> Self {
     //     Self {
diff --git a/src/tensor.rs b/src/tensor.rs
index c4a3580..637c8ae 100644
--- a/src/tensor.rs
+++ b/src/tensor.rs
@@ -250,6 +250,10 @@ where
         }
     }
 
+    pub fn is_dynamic(&self) -> bool {
+        self.shape().iter().any(|&x| x == -1)
+    }
+
     /// DO not use this function directly
     /// # Safety
     /// This is just provided as a 1:1 compat mostly for possible later use
@@ -654,3 +658,26 @@ pub fn test_tensor_borrow_mut() {
     tensor.host_mut().fill(1);
     assert_eq!(data, &[1, 1, 1, 1, 1, 1]);
 }
+
+pub struct Dyn<T> {
+    __marker: PhantomData<T>,
+}
+impl<T> seal::Sealed for Dyn<T> {}
+
+impl<T: super::TensorType> super::TensorType for Dyn<T> {
+    type H = T::H;
+    fn host() -> bool {
+        T::host()
+    }
+    fn device() -> bool {
+        T::device()
+    }
+    fn owned() -> bool {
+        T::owned()
+    }
+    fn borrowed() -> bool {
+        T::borrowed()
+    }
+}
+
+// impl<T: super::TensorType> super::Tensor<Dyn<T>> {}
diff --git a/tests/basic.rs b/tests/basic.rs
index b2c8909..eea2df0 100644
--- a/tests/basic.rs
+++ b/tests/basic.rs
@@ -58,3 +58,52 @@ fn test_basic_coreml() {
 fn test_basic_opengl() {
     test_basic(ForwardType::OpenGL).unwrap();
 }
+
+#[cfg(test)]
+pub fn test_multipath_session(backend: ForwardType, backend2: ForwardType) -> Result<()> {
+    use mnn::BackendConfig;
+
+    let mut net = mnn::Interpreter::from_bytes(Model::new())?;
+    let mut config = ScheduleConfig::new();
+    config.set_type(backend);
+    config.set_backup_type(backend);
+    let mut bc = BackendConfig::new();
+    bc.set_memory_mode(mnn::MemoryMode::High);
+    bc.set_precision_mode(mnn::PrecisionMode::High);
+    bc.set_power_mode(mnn::PowerMode::High);
+    let mut config2 = ScheduleConfig::new();
+    config2.set_type(backend2);
+    config2.set_backup_type(backend2);
+    let mut bc = BackendConfig::new();
+    bc.set_memory_mode(mnn::MemoryMode::High);
+    bc.set_precision_mode(mnn::PrecisionMode::High);
+    bc.set_power_mode(mnn::PowerMode::High);
+    config2.set_backend_config(bc);
+
+    let session = net.create_multipath_session([config, config2])?;
+    let inputs = net.inputs(&session);
+    for input in inputs.iter() {
+        println!("input: {:?}", input);
+        input.tensor::<f32>()?.fill(0.0);
+    }
+    net.run_session(&session)?;
+    let outputs = net.outputs(&session);
+    for output in outputs.iter() {
+        println!("output: {:?}", output);
+        let tensor = output.tensor::<f32>()?;
+        let shape = tensor.shape();
+        assert_eq!(shape.as_ref(), [1, 3, 2048, 2048]);
+    }
+    Ok(())
+}
+
+#[test]
+fn test_multi_path_cpu_cpu() {
+    test_multipath_session(ForwardType::CPU, ForwardType::CPU).unwrap();
+}
+
+#[cfg(feature = "opencl")]
+#[test]
+fn test_multi_path_opencl_cpu() {
+    test_multipath_session(ForwardType::OpenCL, ForwardType::CPU).unwrap();
+}