Move library wrapper to separate file, refactor code

README.md

@@ -47,10 +47,14 @@ python rwkv\convert_pytorch_rwkv_to_ggml.py C:\RWKV-4-Pile-169M-20220807-8023.pt
 #### 3. Use the model in Python:
 
 ```python
-# This file is located at rwkv/rwkv_cpp.py
+# These files are located in rwkv directory
-import rwkv_cpp
+import rwkv_cpp_model
+import rwkv_cpp_shared_library
 
-model = rwkv_cpp.RWKVModel(r'bin\Release\rwkv.dll', r'C:\rwkv.cpp-169M.bin')
+model = rwkv_cpp_model.RWKVModel(
+    rwkv_cpp_shared_library.load_rwkv_shared_library(),
+    r'C:\rwkv.cpp-169M.bin'
+)
 
 logits, state = None, None
 
@@ -59,7 +63,7 @@ for token in [1, 2, 3]:
     
     print(f'Output logits: {logits}')
 
-# Don't forget to free memory after you've done working with the model
+# Don't forget to free the memory after you've done working with the model
 model.free()
 
 ```

rwkv.cpp

@@ -163,7 +163,7 @@ struct rwkv_context {
     bool freed;
 };
 
-struct rwkv_context * rwkv_init_from_file(const char * file_path, int n_threads) {
+struct rwkv_context * rwkv_init_from_file(const char * file_path, uint32_t n_threads) {
     FILE * file = fopen(file_path, "rb");
     RWKV_ASSERT_NULL(file != NULL, "Failed to open file %s", file_path);
 
@@ -505,15 +505,15 @@ struct rwkv_context * rwkv_init_from_file(const char * file_path, int n_threads)
     return rwkv_ctx;
 }
 
-size_t rwkv_get_state_buffer_element_count(struct rwkv_context * ctx) {
+uint32_t rwkv_get_state_buffer_element_count(struct rwkv_context * ctx) {
     return ctx->model->n_layer * 5 * ctx->model->n_embed;
 }
 
-size_t rwkv_get_logits_buffer_element_count(struct rwkv_context * ctx) {
+uint32_t rwkv_get_logits_buffer_element_count(struct rwkv_context * ctx) {
     return ctx->model->n_vocab;
 }
 
-bool rwkv_eval(struct rwkv_context * ctx, long int token, float * state_in, float * state_out, float * logits_out) {
+bool rwkv_eval(struct rwkv_context * ctx, int32_t token, float * state_in, float * state_out, float * logits_out) {
     RWKV_ASSERT_FALSE(state_out != NULL, "state_out is NULL");
     RWKV_ASSERT_FALSE(logits_out != NULL, "logits_out is NULL");
 
@@ -564,7 +564,7 @@ void rwkv_free(struct rwkv_context * ctx) {
     delete ctx;
 }
 
-bool rwkv_quantize_model_file(const char * model_file_path_in, const char * model_file_path_out, int q_type) {
+bool rwkv_quantize_model_file(const char * model_file_path_in, const char * model_file_path_out, uint32_t q_type) {
     RWKV_ASSERT_FALSE(q_type == 2 || q_type == 3, "Unsupported quantization type %d", q_type);
 
     ggml_type type;

rwkv.h

@@ -33,7 +33,7 @@ extern "C" {
     // Returns NULL on any error. Error messages would be printed to stderr.
     // - model_file_path: path to model file in ggml format.
     // - n_threads: count of threads to use, must be positive.
-    RWKV_API struct rwkv_context * rwkv_init_from_file(const char * model_file_path, int n_threads);
+    RWKV_API struct rwkv_context * rwkv_init_from_file(const char * model_file_path, uint32_t n_threads);
 
     // Evaluates the model for a single token.
     // Returns false on any error. Error messages would be printed to stderr.
@@ -41,13 +41,13 @@ extern "C" {
     // - state_in: FP32 buffer of size rwkv_get_state_buffer_element_count; or NULL, if this is a first pass.
     // - state_out: FP32 buffer of size rwkv_get_state_buffer_element_count. This buffer will be written to.
     // - logits_out: FP32 buffer of size rwkv_get_logits_buffer_element_count. This buffer will be written to.
-    RWKV_API bool rwkv_eval(struct rwkv_context * ctx, long int token, float * state_in, float * state_out, float * logits_out);
+    RWKV_API bool rwkv_eval(struct rwkv_context * ctx, int32_t token, float * state_in, float * state_out, float * logits_out);
 
     // Returns count of FP32 elements in state buffer.
-    RWKV_API size_t rwkv_get_state_buffer_element_count(struct rwkv_context * ctx);
+    RWKV_API uint32_t rwkv_get_state_buffer_element_count(struct rwkv_context * ctx);
 
     // Returns count of FP32 elements in logits buffer.
-    RWKV_API size_t rwkv_get_logits_buffer_element_count(struct rwkv_context * ctx);
+    RWKV_API uint32_t rwkv_get_logits_buffer_element_count(struct rwkv_context * ctx);
 
     // Frees all allocated memory and the context.
     RWKV_API void rwkv_free(struct rwkv_context * ctx);
@@ -57,7 +57,7 @@ extern "C" {
     // - model_file_path_in: path to model file in ggml format, must be either FP32 or FP16.
     // - model_file_path_out: quantized model will be written here.
     // - q_type: set to 2 for GGML_TYPE_Q4_0, set to 3 for GGML_TYPE_Q4_1.
-    RWKV_API bool rwkv_quantize_model_file(const char * model_file_path_in, const char * model_file_path_out, int q_type);
+    RWKV_API bool rwkv_quantize_model_file(const char * model_file_path_in, const char * model_file_path_out, uint32_t q_type);
 
     // Returns system information string.
     RWKV_API const char * rwkv_get_system_info_string(void);

rwkv/compare_with_reference_implementation.py

@@ -1,20 +1,19 @@
 # Compares logits from rwkv.cpp implementation of RWKV with logits from reference implementation of RWKV.
 # Reference logits were generated with RWKV-4-Pile-169M-20220807-8023.pth model in PyTorch.
 # Reference implementation code: https://github.com/BlinkDL/ChatRWKV/blob/0d0abf181356c6f27501274cad18bdf28c83a45b/RWKV_in_150_lines.py
-# Usage: python compare_with_reference_implementation.py bin\Release\main_rwkv.exe C:\rwkv.cpp-169M.bin
+# Usage: python compare_with_reference_implementation.py C:\rwkv.cpp-169M.bin
 
 import os
 import struct
 import argparse
-import subprocess
 import torch
 import numpy as np
-import rwkv_cpp
+import rwkv_cpp_model
+import rwkv_cpp_shared_library
 from typing import List, Tuple, Any
 
 def parse_args():
     parser = argparse.ArgumentParser(description='Compare logits from rwkv.cpp implementation of RWKV with logits from reference implementation of RWKV')
-    parser.add_argument('main_executable_path', help='Path to main rwkv.cpp executable file or shared library')
     parser.add_argument('ggml_model_path', help='Path to rwkv.cpp checkpoint file')
     return parser.parse_args()
 
@@ -22,17 +21,12 @@ def main() -> None:
     args = parse_args()
 
     # Don't want to depend on tokenizer here.
-    # Exact string is:
+    tokens: List[int] = [4, 3631, 4420, 2412, 953, 432, 391, 30567, 87, 15, 14161, 7092, 273, 416, 27767, 55, 342,
-    # context = "1 In the beginning God created the heaven and the earth. " \
+                         2412, 953, 432, 3806, 7092, 273, 416, 27767, 55, 15, 187, 4, 19039, 2412, 953, 497, 4561,
-    #           "2 And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters. " \
+                         342, 416, 27767, 55, 14, 21, 14, 49, 587, 14, 17809, 46, 14, 938, 14256, 28950, 14, 1438,
-    #           "3 And God said, Let there be light: and there was light. " \
+                         1508, 15, 81, 394, 1566, 275, 8462, 22097, 348, 15, 187, 4, 43825, 27, 15548, 7277, 64,
-    #           "4 And God saw the light, that it was good: and God divided the light from the darkness."
+                         3113, 64, 14005, 64, 39595, 15, 4789, 10269, 61, 18992, 61, 7265, 64, 30217, 39297, 15,
-    # The Bible was the first non-copyrighted public domain text that came to my mind.
+                         20963, 330, 27, 190, 30567, 87, 15, 14161, 14, 17809, 46, 15, 4805]
-    tokens: List[int] = [18, 496, 253, 5068, 2656, 3562, 253, 13926, 285, 253, 6149, 15, 374, 1244, 253, 6149, 369, 1293, 830,
-                         13, 285, 2991, 28, 285, 13862, 369, 2220, 253, 2454, 273, 253, 3676, 15, 1244, 253, 14559, 273, 2656,
-                         4395, 2220, 253, 2454, 273, 253, 12685, 15, 495, 1244, 2656, 753, 13, 1281, 627, 320, 1708, 27, 285,
-                         627, 369, 1708, 15, 577, 1244, 2656, 3047, 253, 1708, 13, 326, 352, 369, 1175, 27, 285, 2656, 4272,
-                         253, 1708, 432, 253, 13862, 15]
 
     threshold: float
 
@@ -50,7 +44,7 @@ def main() -> None:
             threshold = 0.000005
         elif data_type == 1:
             # FP16, lower precision, so higher threshold
-            threshold = 0.003
+            threshold = 0.0032
         elif data_type == 2:
             # INT4 quantized, even lower precision, so even higher threshold
             # This threshold will let some bugs pass
@@ -59,42 +53,24 @@ def main() -> None:
             # This format stores more data, so error would be lower
             threshold = 1.2
 
-    model = None
+    model = rwkv_cpp_model.RWKVModel(rwkv_cpp_shared_library.load_rwkv_shared_library(), args.ggml_model_path)
-
-    if args.main_executable_path.lower().endswith('.dll') or args.main_executable_path.lower().endswith('.so'):
-        print('Testing shared library')
-
-        model = rwkv_cpp.RWKVModel(args.main_executable_path, args.ggml_model_path)
-    else:
-        print('Testing main_rwkv executable')
 
     def compare_logits(tokens_subset: List[int]) -> None:
         token_count: int = len(tokens_subset)
-        state_path: str = './state.bin'
-        logits_path: str = './logits.bin'
 
         logits, state = None, None
 
         for i in range(token_count):
             token: int = tokens_subset[i]
 
+            if token_count <= 10 or i % (token_count // 10) == 0:
                 print(f'{i + 1}/{token_count}')
 
-            if model is not None:
+            logits, state = model.eval(token, state, state, logits)
-                logits, state = model.eval(token, state)
+
-            else:
+        actual_logits = logits
-                subprocess.run(
+
-                    [
+        # ---
-                        args.main_executable_path,
-                        args.ggml_model_path,
-                        str(token),
-                        # If this is the first token, let the script create a new state.
-                        '' if i == 0 else state_path,
-                        state_path,
-                        logits_path
-                    ],
-                    check=True
-                )
 
         expected_logits_path: str = f'expected_logits_169M_20220807_8023_{len(tokens_subset)}_tokens.bin'
 
@@ -104,11 +80,7 @@ def main() -> None:
         with open(expected_logits_path, 'rb') as logits_file:
             expected_logits = torch.tensor(np.frombuffer(logits_file.read(), dtype=np.single))
 
-        if model is not None:
+        # ---
-            actual_logits = logits
-        else:
-            with open(logits_path, 'rb') as logits_file:
-                actual_logits = torch.tensor(np.frombuffer(logits_file.read(), dtype=np.single))
 
         difference: float = (torch.sum(expected_logits - actual_logits) / len(expected_logits)).item()
 
@@ -118,8 +90,6 @@ def main() -> None:
 
         assert abs(difference) <= threshold, 'Difference is too big'
 
-    # Check small token amount first to avoid waiting too long before seeing that model is broken
-    compare_logits(tokens[:4])
     compare_logits(tokens)
 
     print()

rwkv/quantize.py

@@ -1,12 +1,11 @@
 # Quantizes rwkv.cpp model file from FP32 or FP16 to Q4_0 or Q4_1.
 # Usage: python quantize.py bin\Release\rwkv.dll C:\rwkv.cpp-169M-float32.bin C:\rwkv.cpp-169M-q4_1.bin 3
 
-import ctypes
 import argparse
+import rwkv_cpp_shared_library
 
 def parse_args():
     parser = argparse.ArgumentParser(description='Quantize rwkv.cpp model file from FP32 or FP16 to Q4_0 or Q4_1')
-    parser.add_argument('shared_library_path', help='Path to rwkv.cpp shared library')
     parser.add_argument('src_path', help='Path to FP32/FP16 checkpoint file')
     parser.add_argument('dest_path', help='Path to resulting checkpoint file, will be overwritten')
     parser.add_argument('data_type', help='Data type, 2 (GGML_TYPE_Q4_0) or 3 (GGML_TYPE_Q4_1)', type=int, choices=[2, 3], default=3)
@@ -15,19 +14,14 @@ def parse_args():
 def main() -> None:
     args = parse_args()
 
-    library = ctypes.cdll.LoadLibrary(args.shared_library_path)
+    library = rwkv_cpp_shared_library.load_rwkv_shared_library()
 
-    library.rwkv_quantize_model_file.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_int]
+    library.rwkv_quantize_model_file(
-    library.rwkv_quantize_model_file.restype = ctypes.c_bool
+        args.src_path,
-
+        args.dest_path,
-    result: bool = library.rwkv_quantize_model_file(
+        args.data_type
-        args.src_path.encode('utf-8'),
-        args.dest_path.encode('utf-8'),
-        ctypes.c_int(args.data_type)
     )
 
-    assert result, 'Failed to quantize, check stderr'
-
     print('Done')
 
 if __name__ == "__main__":

rwkv/rwkv_cpp.py

@@ -1,127 +0,0 @@
-import os
-import ctypes
-import torch
-import multiprocessing
-from typing import Tuple, Optional
-
-P_FLOAT = ctypes.POINTER(ctypes.c_float)
-
-class RWKVModel:
-    """
-    PyTorch wrapper around rwkv.cpp shared library.
-    """
-
-    def __init__(
-            self,
-            shared_library_path: str,
-            model_path: str,
-            thread_count: int = max(1, multiprocessing.cpu_count() // 2)
-    ):
-        """
-        Loads the model and prepares it for inference.
-        In case of any error, this method will throw an exception.
-
-        Parameters
-        ----------
-        shared_library_path : str
-            Path to rwkv.cpp shared library. On Windows, it would look like 'rwkv.dll'. On UNIX, 'rwkv.so'.
-        model_path : str
-            Path to RWKV model file in ggml format.
-        thread_count : int
-            Thread count to use. If not set, defaults to CPU count / 2.
-        """
-
-        assert os.path.isfile(shared_library_path), f'{shared_library_path} is not a file'
-        assert os.path.isfile(model_path), f'{model_path} is not a file'
-        assert thread_count > 0, 'Thread count must be positive'
-
-        self.library = ctypes.cdll.LoadLibrary(shared_library_path)
-
-        self.library.rwkv_init_from_file.argtypes = [ctypes.c_char_p, ctypes.c_int]
-        self.library.rwkv_init_from_file.restype = ctypes.c_void_p
-
-        self.library.rwkv_eval.argtypes = [
-            ctypes.c_void_p, # ctx
-            ctypes.c_long, # token
-            P_FLOAT, # state_in
-            P_FLOAT, # state_out
-            P_FLOAT  # logits_out
-        ]
-        self.library.rwkv_eval.restype = ctypes.c_bool
-
-        self.library.rwkv_get_state_buffer_element_count.argtypes = [ctypes.c_void_p]
-        self.library.rwkv_get_state_buffer_element_count.restype = ctypes.c_size_t
-
-        self.library.rwkv_get_logits_buffer_element_count.argtypes = [ctypes.c_void_p]
-        self.library.rwkv_get_logits_buffer_element_count.restype = ctypes.c_size_t
-
-        self.library.rwkv_free.argtypes = [ctypes.c_void_p]
-        self.library.rwkv_free.restype = None
-
-        self.ctx = self.library.rwkv_init_from_file(model_path.encode('utf-8'), ctypes.c_int(thread_count))
-
-        assert self.ctx is not None, 'Failed to load the model, see stderr'
-
-        self.state_buffer_element_count = self.library.rwkv_get_state_buffer_element_count(self.ctx)
-        self.logits_buffer_element_count = self.library.rwkv_get_logits_buffer_element_count(self.ctx)
-
-        self.valid = True
-
-    def eval(self, token: int, state_in: Optional[torch.Tensor]) -> Tuple[torch.Tensor, torch.Tensor]:
-        """
-        Evaluates the model for a single token.
-        In case of any error, this method will throw an exception.
-
-        Parameters
-        ----------
-        token : int
-            Index of next token to be seen by the model. Must be in range 0 <= token < n_vocab.
-        state_in : Optional[torch.Tensor]
-            State from previous call of this method. If this is a first pass, set it to None.
-
-        Returns
-        -------
-        logits, state
-            Logits vector of shape (n_vocab); state for the next step.
-        """
-
-        assert self.valid, 'Model was freed'
-
-        if state_in is None:
-            state_in_ptr = 0
-        else:
-            expected_shape = (self.state_buffer_element_count,)
-
-            assert state_in.is_contiguous(), 'State tensor is not contiguous'
-            assert state_in.shape == expected_shape, f'Invalid state shape {state_in.shape}, expected {expected_shape}'
-
-            state_in_ptr = state_in.storage().data_ptr()
-
-        # TODO Probably these allocations can be optimized away
-        state_out: torch.Tensor = torch.zeros(self.state_buffer_element_count, dtype=torch.float32, device='cpu')
-        logits_out: torch.Tensor = torch.zeros(self.logits_buffer_element_count, dtype=torch.float32, device='cpu')
-
-        result = self.library.rwkv_eval(
-            self.ctx,
-            ctypes.c_long(token),
-            ctypes.cast(state_in_ptr, P_FLOAT),
-            ctypes.cast(state_out.storage().data_ptr(), P_FLOAT),
-            ctypes.cast(logits_out.storage().data_ptr(), P_FLOAT)
-        )
-
-        assert result, 'Inference failed, see stderr'
-
-        return logits_out, state_out
-
-    def free(self):
-        """
-        Frees all allocated resources.
-        In case of any error, this method will throw an exception.
-        The object must not be used anymore after calling this method.
-        """
-
-        assert self.valid, 'Already freed'
-
-        self.valid = False
-
-        self.library.rwkv_free(self.ctx)

rwkv/rwkv_cpp_model.py

@@ -0,0 +1,117 @@
+import os
+import torch
+import multiprocessing
+import rwkv_cpp_shared_library
+from typing import Tuple, Optional
+
+class RWKVModel:
+    """
+    PyTorch wrapper around rwkv.cpp model.
+    """
+
+    def __init__(
+            self,
+            shared_library: rwkv_cpp_shared_library.RWKVSharedLibrary,
+            model_path: str,
+            thread_count: int = max(1, multiprocessing.cpu_count() // 2)
+    ):
+        """
+        Loads the model and prepares it for inference.
+        In case of any error, this method will throw an exception.
+
+        Parameters
+        ----------
+        shared_library : RWKVSharedLibrary
+            rwkv.cpp shared library.
+        model_path : str
+            Path to RWKV model file in ggml format.
+        thread_count : int
+            Thread count to use. If not set, defaults to CPU count / 2.
+        """
+
+        assert os.path.isfile(model_path), f'{model_path} is not a file'
+        assert thread_count > 0, 'Thread count must be positive'
+
+        self.library = shared_library
+
+        self.ctx = self.library.rwkv_init_from_file(model_path, thread_count)
+
+        self.state_buffer_element_count = self.library.rwkv_get_state_buffer_element_count(self.ctx)
+        self.logits_buffer_element_count = self.library.rwkv_get_logits_buffer_element_count(self.ctx)
+
+        self.valid = True
+
+    def eval(
+            self,
+            token: int,
+            state_in: Optional[torch.Tensor],
+            state_out: Optional[torch.Tensor] = None,
+            logits_out: Optional[torch.Tensor] = None
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """
+        Evaluates the model for a single token.
+        In case of any error, this method will throw an exception.
+
+        Parameters
+        ----------
+        token : int
+            Index of next token to be seen by the model. Must be in range 0 <= token < n_vocab.
+        state_in : Optional[torch.Tensor]
+            State from previous call of this method. If this is a first pass, set it to None.
+        state_out : Optional[torch.Tensor]
+            Optional output tensor for state. If provided, must be of type float32, contiguous and of shape (state_buffer_element_count).
+        logits_out : Optional[torch.Tensor]
+            Optional output tensor for logits. If provided, must be of type float32, contiguous and of shape (logits_buffer_element_count).
+
+        Returns
+        -------
+        logits, state
+            Logits vector of shape (n_vocab); state for the next step.
+        """
+
+        assert self.valid, 'Model was freed'
+
+        def validate_buffer(buf: torch.Tensor, name: str, size: int) -> None:
+            assert buf.dtype == torch.float32, f'{name} is not of type float32'
+            assert buf.is_contiguous(), f'{name} is not contiguous'
+            assert buf.shape == (size,), f'{name} has invalid shape {buf.shape}, expected ({size})'
+
+        if state_in is not None:
+            validate_buffer(state_in, 'state_in', self.state_buffer_element_count)
+
+            state_in_ptr = state_in.storage().data_ptr()
+        else:
+            state_in_ptr = 0
+
+        if state_out is not None:
+            validate_buffer(state_out, 'state_out', self.state_buffer_element_count)
+        else:
+            state_out = torch.zeros(self.state_buffer_element_count, dtype=torch.float32, device='cpu')
+
+        if logits_out is not None:
+            validate_buffer(logits_out, 'logits_out', self.logits_buffer_element_count)
+        else:
+            logits_out = torch.zeros(self.logits_buffer_element_count, dtype=torch.float32, device='cpu')
+
+        self.library.rwkv_eval(
+            self.ctx,
+            token,
+            state_in_ptr,
+            state_out.storage().data_ptr(),
+            logits_out.storage().data_ptr()
+        )
+
+        return logits_out, state_out
+
+    def free(self):
+        """
+        Frees all allocated resources.
+        In case of any error, this method will throw an exception.
+        The object must not be used anymore after calling this method.
+        """
+
+        assert self.valid, 'Already freed'
+
+        self.valid = False
+
+        self.library.rwkv_free(self.ctx)

rwkv/rwkv_cpp_shared_library.py

@@ -0,0 +1,204 @@
+import os
+import sys
+import ctypes
+from typing import Optional
+
+P_FLOAT = ctypes.POINTER(ctypes.c_float)
+
+class RWKVContext:
+
+    def __init__(self, ptr: ctypes.pointer):
+        self.ptr = ptr
+
+class RWKVSharedLibrary:
+    """
+    Python wrapper around rwkv.cpp shared library.
+    """
+
+    def __init__(self, shared_library_path: str):
+        """
+        Loads the shared library from specified file.
+        In case of any error, this method will throw an exception.
+
+        Parameters
+        ----------
+        shared_library_path : str
+            Path to rwkv.cpp shared library. On Windows, it would look like 'rwkv.dll'. On UNIX, 'rwkv.so'.
+        """
+
+        self.library = ctypes.cdll.LoadLibrary(shared_library_path)
+
+        self.library.rwkv_init_from_file.argtypes = [ctypes.c_char_p, ctypes.c_uint32]
+        self.library.rwkv_init_from_file.restype = ctypes.c_void_p
+
+        self.library.rwkv_eval.argtypes = [
+            ctypes.c_void_p, # ctx
+            ctypes.c_int32, # token
+            P_FLOAT, # state_in
+            P_FLOAT, # state_out
+            P_FLOAT  # logits_out
+        ]
+        self.library.rwkv_eval.restype = ctypes.c_bool
+
+        self.library.rwkv_get_state_buffer_element_count.argtypes = [ctypes.c_void_p]
+        self.library.rwkv_get_state_buffer_element_count.restype = ctypes.c_uint32
+
+        self.library.rwkv_get_logits_buffer_element_count.argtypes = [ctypes.c_void_p]
+        self.library.rwkv_get_logits_buffer_element_count.restype = ctypes.c_uint32
+
+        self.library.rwkv_free.argtypes = [ctypes.c_void_p]
+        self.library.rwkv_free.restype = None
+
+        self.library.rwkv_free.argtypes = [ctypes.c_void_p]
+        self.library.rwkv_free.restype = None
+
+        self.library.rwkv_quantize_model_file.argtypes = [ctypes.c_char_p, ctypes.c_char_p, ctypes.c_uint32]
+        self.library.rwkv_quantize_model_file.restype = ctypes.c_bool
+
+        self.library.rwkv_get_system_info_string.argtypes = []
+        self.library.rwkv_get_system_info_string.restype = ctypes.c_char_p
+
+    def rwkv_init_from_file(self, model_file_path: str, thread_count: int) -> RWKVContext:
+        """
+        Loads the model from a file and prepares it for inference.
+        Throws an exception in case of any error. Error messages would be printed to stderr.
+
+        Parameters
+        ----------
+        model_file_path : str
+            Path to model file in ggml format.
+        thread_count : int
+            Count of threads to use, must be positive.
+        """
+
+        ptr = self.library.rwkv_init_from_file(model_file_path.encode('utf-8'), ctypes.c_uint32(thread_count))
+        assert ptr is not None, 'rwkv_init_from_file failed, check stderr'
+        return RWKVContext(ptr)
+
+    def rwkv_eval(
+            self,
+            ctx: RWKVContext,
+            token: int,
+            state_in_address: Optional[int],
+            state_out_address: int,
+            logits_out_address: int
+    ) -> None:
+        """
+        Evaluates the model for a single token.
+        Throws an exception in case of any error. Error messages would be printed to stderr.
+
+        Parameters
+        ----------
+        ctx : RWKVContext
+            RWKV context obtained from rwkv_init_from_file.
+        token : int
+            Next token index, in range 0 <= token < n_vocab.
+        state_in_address : int
+            Address of the first element of a FP32 buffer of size rwkv_get_state_buffer_element_count; or None, if this is a first pass.
+        state_out_address : int
+            Address of the first element of a FP32 buffer of size rwkv_get_state_buffer_element_count. This buffer will be written to.
+        logits_out_address : int
+            Address of the first element of a FP32 buffer of size rwkv_get_logits_buffer_element_count. This buffer will be written to.
+        """
+
+        assert self.library.rwkv_eval(
+            ctx.ptr,
+            ctypes.c_int32(token),
+            ctypes.cast(0 if state_in_address is None else state_in_address, P_FLOAT),
+            ctypes.cast(state_out_address, P_FLOAT),
+            ctypes.cast(logits_out_address, P_FLOAT)
+        ), 'rwkv_eval failed, check stderr'
+
+    def rwkv_get_state_buffer_element_count(self, ctx: RWKVContext) -> int:
+        """
+        Returns count of FP32 elements in state buffer.
+
+        Parameters
+        ----------
+        ctx : RWKVContext
+            RWKV context obtained from rwkv_init_from_file.
+        """
+
+        return self.library.rwkv_get_state_buffer_element_count(ctx.ptr)
+
+    def rwkv_get_logits_buffer_element_count(self, ctx: RWKVContext) -> int:
+        """
+        Returns count of FP32 elements in logits buffer.
+
+        Parameters
+        ----------
+        ctx : RWKVContext
+            RWKV context obtained from rwkv_init_from_file.
+        """
+
+        return self.library.rwkv_get_logits_buffer_element_count(ctx.ptr)
+
+    def rwkv_free(self, ctx: RWKVContext) -> None:
+        """
+        Frees all allocated memory and the context.
+
+        Parameters
+        ----------
+        ctx : RWKVContext
+            RWKV context obtained from rwkv_init_from_file.
+        """
+
+        self.library.rwkv_free(ctx.ptr)
+
+        ctx.ptr = ctypes.cast(0, ctypes.c_void_p)
+
+    def rwkv_quantize_model_file(self, model_file_path_in: str, model_file_path_out: str, q_type: int) -> None:
+        """
+        Quantizes FP32 or FP16 model to one of INT4 formats.
+        Throws an exception in case of any error. Error messages would be printed to stderr.
+
+        Parameters
+        ----------
+        model_file_path_in : str
+            Path to model file in ggml format, must be either FP32 or FP16.
+        model_file_path_out : str
+            Quantized model will be written here.
+        q_type : int
+            Set to 2 for GGML_TYPE_Q4_0, set to 3 for GGML_TYPE_Q4_1.
+        """
+
+        assert self.library.rwkv_quantize_model_file(
+            model_file_path_in.encode('utf-8'),
+            model_file_path_out.encode('utf-8'),
+            ctypes.c_uint32(q_type)
+        ), 'rwkv_quantize_model_file failed, check stderr'
+
+    def rwkv_get_system_info_string(self) -> str:
+        """
+        Returns system information string.
+        """
+
+        return self.library.rwkv_get_system_info_string()
+
+def load_rwkv_shared_library() -> RWKVSharedLibrary:
+    """
+    Attempts to find rwkv.cpp shared library and load it.
+    To specify exact path to the library, create an instance of RWKVSharedLibrary explicitly.
+    """
+
+    file_name: str
+
+    if 'win32' in sys.platform or 'cygwin' in sys.platform:
+        file_name = 'rwkv.dll'
+    else:
+        file_name = 'rwkv.so'
+
+    paths = [
+        # If we are in "rwkv" directory
+        f'../bin/Release/{file_name}',
+        # If we are in repo root directory
+        f'bin/Release/{file_name}',
+        # Fallback
+        file_name
+    ]
+
+    for path in paths:
+        if os.path.isfile(path):
+            return RWKVSharedLibrary(path)
+
+    return RWKVSharedLibrary(paths[-1])