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gguf-py : Numpy dequantization for most types (#8939)
* gguf-py : Numpy dequantization for most types * gguf-py : Numpy dequantization for grid-based i-quants
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gguf-py/tests/test_quants.py
Executable file
237
gguf-py/tests/test_quants.py
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#!/usr/bin/env python3
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# Test gguf.quants so that it exactly matches the C implementation of the (de)quantization
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# NOTE: this is kind of a mess, but at least it worked for initially testing the Python implementations.
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from __future__ import annotations
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import argparse
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from math import prod
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import os
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import sys
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from pathlib import Path
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import ctypes
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import logging
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import numpy as np
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# Necessary to load the local gguf package
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if "NO_LOCAL_GGUF" not in os.environ and (Path(__file__).parent.parent.parent / 'gguf-py').exists():
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sys.path.insert(0, str(Path(__file__).parent.parent))
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import gguf
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from gguf.constants import GGMLQuantizationType
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logger = logging.getLogger("test-quants")
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c_float_p = ctypes.POINTER(ctypes.c_float)
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class ggml_init_params(ctypes.Structure):
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_fields_ = [
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("mem_size", ctypes.c_size_t),
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("mem_buffer", ctypes.c_void_p),
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("no_alloc", ctypes.c_bool),
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]
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class GGMLQuants:
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libggml: ctypes.CDLL
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def __init__(self, libggml: Path):
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self.libggml = ctypes.CDLL(str(libggml))
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self.libggml.ggml_quantize_chunk.restype = ctypes.c_size_t
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# enum ggml_type type,
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# const float * src,
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# void * dst,
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# int64_t start,
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# int64_t nrows,
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# int64_t n_per_row,
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# const float * imatrix) {
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self.libggml.ggml_quantize_chunk.argtypes = (
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ctypes.c_int,
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ctypes.POINTER(ctypes.c_float),
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ctypes.c_void_p,
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ctypes.c_int64,
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ctypes.c_int64,
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ctypes.c_int64,
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ctypes.POINTER(ctypes.c_float),
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)
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self.libggml.ggml_quantize_requires_imatrix.restype = ctypes.c_bool
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self.libggml.ggml_quantize_requires_imatrix.argtypes = (ctypes.c_int,)
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for t in (
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"q4_0", "q4_1", "q5_0", "q5_1", "q8_0",
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"q2_K", "q3_K", "q4_K", "q5_K", "q6_K",
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"iq2_xxs", "iq2_xs", "iq2_s", "iq3_xxs", "iq3_s", "iq1_s", "iq1_m",
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"iq4_nl", "iq4_xs",
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):
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dequant_func: ctypes._NamedFuncPointer = getattr(self.libggml, "dequantize_row_" + t)
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dequant_func.restype = None
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dequant_func.argtypes = (ctypes.c_void_p, ctypes.POINTER(ctypes.c_float), ctypes.c_int64)
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self.libggml.ggml_fp16_to_fp32_row.restype = None
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self.libggml.ggml_fp16_to_fp32_row.argtypes = (ctypes.POINTER(ctypes.c_uint16), ctypes.POINTER(ctypes.c_float), ctypes.c_int64)
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self.libggml.ggml_bf16_to_fp32_row.restype = None
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self.libggml.ggml_bf16_to_fp32_row.argtypes = (ctypes.POINTER(ctypes.c_uint16), ctypes.POINTER(ctypes.c_float), ctypes.c_int64)
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self.libggml.ggml_init.argtypes = (ggml_init_params,)
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self.libggml.ggml_init(ggml_init_params(1 * 1024 * 1024, 0, False))
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def dequantize(self, tensor: np.ndarray, qtype: GGMLQuantizationType) -> np.ndarray:
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result = np.zeros(gguf.quant_shape_from_byte_shape(tensor.shape, qtype), dtype=np.float32, order="C")
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if qtype == GGMLQuantizationType.F32:
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# no-op
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result = tensor.view(np.float32)
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elif qtype == GGMLQuantizationType.F16:
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self.libggml.ggml_fp16_to_fp32_row(tensor.ctypes.data_as(ctypes.POINTER(ctypes.c_uint16)), result.ctypes.data_as(c_float_p), result.size)
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elif qtype == GGMLQuantizationType.BF16:
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self.libggml.ggml_bf16_to_fp32_row(tensor.ctypes.data_as(ctypes.POINTER(ctypes.c_uint16)), result.ctypes.data_as(c_float_p), result.size)
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else:
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lw_qname = qtype.name.lower()
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if lw_qname[-1] == "k":
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lw_qname = lw_qname[:-1] + "K"
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dequant_func: ctypes._NamedFuncPointer = getattr(self.libggml, "dequantize_row_" + lw_qname)
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dequant_func(tensor.ctypes.data_as(ctypes.c_void_p), result.ctypes.data_as(c_float_p), result.size)
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return result
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def quantize(self, data: np.ndarray, qtype: GGMLQuantizationType) -> np.ndarray:
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result = np.zeros(gguf.quant_shape_to_byte_shape(data.shape, qtype), dtype=np.uint8, order="C")
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if self.libggml.ggml_quantize_requires_imatrix(qtype.value):
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# TODO: is a column-wise sum of squares appropriate?
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qw = np.sum((data * data).reshape((-1, data.shape[-1])), axis=0).ctypes.data_as(c_float_p)
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else:
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qw = ctypes.cast(0, c_float_p)
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result_size = self.libggml.ggml_quantize_chunk(qtype.value, data.ctypes.data_as(c_float_p), result.ctypes.data_as(ctypes.c_void_p), 0, prod(data.shape[:-1]), data.shape[-1], qw)
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assert result.size == result_size
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return result
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def compare_tensors(t1: np.ndarray, t2: np.ndarray, qtype: GGMLQuantizationType) -> bool:
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same = np.array_equal(t1, t2)
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if same:
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return True
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else:
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block_size, type_size = gguf.GGML_QUANT_SIZES[qtype]
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if t1.dtype == np.float32:
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t1 = t1.reshape((-1, block_size))
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t2 = t2.reshape((-1, block_size))
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else:
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t1 = t1.reshape((-1, type_size))
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t2 = t2.reshape((-1, type_size))
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x = t1.view(np.uint8) ^ t2.view(np.uint8)
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diff_bits = np.count_nonzero(np.unpackbits(x, axis=-1), axis=-1)
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num_bad_blocks = np.count_nonzero(diff_bits, axis=0)
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if num_bad_blocks == 0 and t1.shape == t2.shape:
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logger.debug("Bits are equal, but arrays don't match, likely contains NANs")
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return True
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logger.debug(f"{num_bad_blocks} bad blocks ({100 * num_bad_blocks / x.shape[0]:.6f}%)")
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bad_block_id = np.argmax(diff_bits, axis=0)
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logger.debug(f"Worst block id: {bad_block_id}")
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logger.debug(f"Sample bad block ({diff_bits[bad_block_id]} differing bits):\n{t1[bad_block_id]}\nReference:\n{t2[bad_block_id]}")
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sum_diff_bits = np.sum(diff_bits)
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logger.debug(f"{sum_diff_bits} bits differ ({100 * sum_diff_bits/(x.size * 8):.6f}%)")
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return False
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def do_test(libggml_path: Path, quick: bool = False):
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ggml_quants = GGMLQuants(libggml_path)
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np.set_printoptions(precision=None, threshold=(4 * 256) + 1, formatter={"int": lambda n: "0x%02X" % n})
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r = np.random.randn(8, 1024, 1024).astype(np.float32, copy=False)
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for qtype in (GGMLQuantizationType.F16, *gguf.quants._type_traits.keys()):
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has_dequantize = False
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has_quantize = False
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try:
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gguf.dequantize(np.zeros((gguf.GGML_QUANT_SIZES[qtype][1]), dtype=np.uint8), qtype)
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has_dequantize = True
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except (NotImplementedError, AssertionError) as e:
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if isinstance(e, AssertionError):
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logger.error(f"Error with {qtype.name}: {e}")
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raise e
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try:
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gguf.quantize(np.zeros((gguf.GGML_QUANT_SIZES[qtype][0]), dtype=np.float32), qtype)
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has_quantize = True
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except (NotImplementedError, AssertionError) as e:
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if isinstance(e, AssertionError):
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logger.error(f"Error with {qtype.name}: {e}")
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raise e
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if not has_dequantize and not has_quantize:
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continue
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logger.info(f"Testing {qtype.name}")
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rc = r.copy(order="C")
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pyq = None
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ggq = None
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if has_quantize:
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logger.debug(f"Quantizing to {qtype.name} with Python")
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pyq = gguf.quants.quantize(rc, qtype)
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logger.debug(f"Quantizing to {qtype.name} with C")
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ggq = ggml_quants.quantize(rc, qtype)
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if qtype == GGMLQuantizationType.F16:
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pyq = pyq.view(np.uint8)
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quant_equal = compare_tensors(pyq, ggq, qtype)
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if not quant_equal:
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logger.error(f"Quantization to {qtype.name} does not match ❌")
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else:
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logger.info(f"Quantization to {qtype.name} matches exactly ✅")
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if has_dequantize:
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if ggq is None and not quick:
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logger.debug(f"Quantizing to {qtype.name} with C")
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ggq = ggml_quants.quantize(rc, qtype)
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if ggq is not None:
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logger.debug(f"Dequantizing from {qtype.name} with Python")
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pydq = gguf.quants.dequantize(ggq, qtype)
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logger.debug(f"Dequantizing from {qtype.name} with C")
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ggdq = ggml_quants.dequantize(ggq, qtype)
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dequant_equal = compare_tensors(pydq, ggdq, qtype)
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if not dequant_equal:
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logger.error(f"Dequantization from {qtype.name} does not match ❌")
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else:
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logger.info(f"Dequantization from {qtype.name} matches exactly ✅")
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rq_shape = gguf.quants.quant_shape_to_byte_shape((8, 1024, 1024 // 2), qtype)
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rq = np.random.random(rq_shape).astype(np.float16).view(np.uint8)
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logger.debug(f"Dequantizing random f16 data as {qtype.name} with Python")
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pydq = gguf.quants.dequantize(rq, qtype)
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logger.debug(f"Dequantizing random f16 data as {qtype.name} with C")
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ggdq = ggml_quants.dequantize(rq, qtype)
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dequant_equal = compare_tensors(pydq, ggdq, qtype)
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if not dequant_equal:
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logger.error(f"Dequantization from random f16 data as {qtype.name} does not match ❌")
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else:
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logger.info(f"Dequantization from random f16 data as {qtype.name} matches exactly ✅")
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description="Test Python (de)quantization against the reference C implementation")
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parser.add_argument("--libggml", type=Path, default=Path(__file__).parent.parent.parent / "build" / "ggml" / "src" / "libggml.so", help="The path to libggml.so")
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parser.add_argument("--quick", action="store_true", help="Don't quantize with C when it's not strictly necessary")
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args = parser.parse_args()
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logging.basicConfig(level=logging.DEBUG)
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do_test(args.libggml, args.quick)
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