mirror of
https://github.com/oobabooga/text-generation-webui.git
synced 2024-11-22 08:07:56 +01:00
596 lines
24 KiB
Python
596 lines
24 KiB
Python
import json
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import math
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import pprint
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import torch
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import transformers
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from transformers import LogitsWarper, is_torch_xpu_available
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from transformers.generation.logits_process import (
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LogitNormalization,
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LogitsProcessor,
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LogitsProcessorList
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)
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from modules import shared
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from modules.logging_colors import logger
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global_scores = None
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class TemperatureLogitsWarperCustom(LogitsWarper):
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'''
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A copy of the original Transformers temperature logits warper.
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'''
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def __init__(self, temperature: float):
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if not isinstance(temperature, float) or not (temperature > 0):
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except_msg = (
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f"`temperature` (={temperature}) has to be a strictly positive float, otherwise your next token "
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"scores will be invalid."
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)
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if isinstance(temperature, float) and temperature == 0.0:
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except_msg += " If you're looking for greedy decoding strategies, set `do_sample=False`."
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raise ValueError(except_msg)
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self.temperature = temperature
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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scores = scores / self.temperature
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return scores
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class DynamicTemperatureLogitsWarper(LogitsWarper):
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'''
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Dynamic temperature.
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'''
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def __init__(self, dynatemp_low: float, dynatemp_high: float, dynatemp_exponent: float):
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self.dynatemp_low = dynatemp_low
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self.dynatemp_high = dynatemp_high
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self.dynatemp_exponent = dynatemp_exponent
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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min_temp = self.dynatemp_low
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max_temp = self.dynatemp_high
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exponent_val = self.dynatemp_exponent
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# Convert logits to probabilities
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probs = torch.softmax(scores, dim=-1)
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# Calculate entropy of the softmax probabilities
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entropy = -1.0 * torch.where(probs > 0, probs * torch.log(probs), torch.zeros_like(probs)).sum()
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# Guard against future possible division by zero
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entropy = max(entropy, torch.tensor(1e-10)) # Ensures entropy is slightly greater than 0
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# Any logits which are not -Infinity will be considered for calculating max entropy.
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num_valid_tokens = torch.sum(scores > -float('inf')).item()
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# Now, calculate the max entropy by using only the valid tokens' count
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max_entropy = math.log(num_valid_tokens)
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# Guard against future possible division by zero
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max_entropy = max_entropy if max_entropy > 0.0 else 1e-10
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# Normalize the entropy
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normalized_entropy = entropy / max_entropy
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# Map the normalized entropy to the desired temperature range using the power function
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dyn_temp = min_temp + (max_temp - min_temp) * (normalized_entropy.pow(exponent_val))
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# Apply the dynamically calculated temperature scaling
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scores = scores / dyn_temp
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# print("----------------------\nTemperature from generation_config:", self.temperature)
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# print("min_temp:", min_temp)
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# print("max_temp:", max_temp)
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# print("Entropy:", entropy.item())
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# print("Max Possible Entropy considering valid tokens only:", max_entropy)
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# print("Normalized Entropy:", normalized_entropy.item())
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# print("Dynamic Temperature (dyn_temp):", dyn_temp.item())
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# print("----------------------")
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# max_prob_token_id = torch.argmax(scores, dim=-1) # Get the token ID with the highest probability
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# max_prob_token = shared.tokenizer.convert_ids_to_tokens(int(max_prob_token_id)) # Convert ID to token
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# print("--- T=", float(dyn_temp), "token=", max_prob_token, "min=", min_temp, "max=", max_temp, "exponent=", exponent_val)
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return scores
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class QuadraticSamplingLogitsWarper(LogitsWarper):
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'''
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Quadratic sampling with smoothing factor and smoothing curve parameters.
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'''
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def __init__(self, smoothing_factor, smoothing_curve):
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self.smoothing_factor = smoothing_factor
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self.smoothing_curve = smoothing_curve
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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# Compute necessary values
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max_logit = scores.max()
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diff = scores - max_logit
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k = (3 - self.smoothing_curve) / 2
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s = (self.smoothing_curve - 1) / 2
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# Apply transformation to non-negative infinity values
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transformed_logits = torch.where(
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scores != float('-inf'),
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-(k * self.smoothing_factor * diff**2) + (s * self.smoothing_factor * diff**3) + max_logit,
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scores
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)
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return transformed_logits
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class MinPLogitsWarper(LogitsWarper):
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def __init__(self, min_p: float, filter_value: float = -float("Inf"), min_tokens_to_keep: int = 1):
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if min_p < 0 or min_p > 1.0:
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raise ValueError(f"`min_p` has to be a float >= 0 and <= 1, but is {min_p}")
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self.min_p = min_p
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self.filter_value = filter_value
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self.min_tokens_to_keep = min_tokens_to_keep
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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# Convert logits to probabilities
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probs = torch.softmax(scores, dim=-1)
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# Get the probability of the top token for each sequence in the batch
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top_probs, _ = probs.max(dim=-1, keepdim=True)
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# Calculate the actual min_p threshold by scaling min_p with the top token's probability
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scaled_min_p = self.min_p * top_probs
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# Create a mask for tokens that have a probability less than the scaled min_p
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tokens_to_remove = probs < scaled_min_p
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sorted_indices = torch.argsort(scores, descending=True, dim=-1)
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sorted_indices_to_remove = torch.gather(tokens_to_remove, dim=-1, index=sorted_indices)
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if self.min_tokens_to_keep > 1:
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# Keep at least min_tokens_to_keep
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sorted_indices_to_remove[..., : self.min_tokens_to_keep] = False
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indices_to_remove = sorted_indices_to_remove.scatter(1, sorted_indices, sorted_indices_to_remove)
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scores = scores.masked_fill(indices_to_remove, self.filter_value)
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return scores
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class TailFreeLogitsWarper(LogitsWarper):
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def __init__(self, tfs: float, filter_value: float = -float("Inf"), min_tokens_to_keep: int = 1):
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tfs = float(tfs)
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if tfs < 0 or tfs > 1.0:
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raise ValueError(f"`tfs` has to be a float >= 0 and <= 1, but is {tfs}")
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self.tfs = tfs
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self.filter_value = filter_value
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self.min_tokens_to_keep = min_tokens_to_keep
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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sorted_logits, sorted_indices = torch.sort(scores, descending=True)
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probs = sorted_logits.softmax(dim=-1)
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# Compute second derivative normalized CDF
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d2 = probs.diff().diff().abs()
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normalized_d2 = d2 / d2.sum(dim=-1, keepdim=True)
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normalized_d2_cdf = normalized_d2.cumsum(dim=-1)
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# Remove tokens with CDF value above the threshold (token with 0 are kept)
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sorted_indices_to_remove = normalized_d2_cdf > self.tfs
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# Centre the distribution around the cutoff as in the original implementation of the algorithm
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sorted_indices_to_remove = torch.cat(
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(
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torch.zeros(scores.shape[0], 1, dtype=torch.bool, device=scores.device),
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sorted_indices_to_remove,
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torch.ones(scores.shape[0], 1, dtype=torch.bool, device=scores.device),
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),
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dim=-1,
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)
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if self.min_tokens_to_keep > 1:
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# Keep at least min_tokens_to_keep
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sorted_indices_to_remove[..., : self.min_tokens_to_keep] = 0
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indices_to_remove = sorted_indices_to_remove.scatter(1, sorted_indices, sorted_indices_to_remove)
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scores = scores.masked_fill(indices_to_remove, self.filter_value)
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return scores
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class TopALogitsWarper(LogitsWarper):
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def __init__(self, top_a: float, filter_value: float = -float("Inf"), min_tokens_to_keep: int = 1):
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top_a = float(top_a)
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if top_a < 0 or top_a > 1.0:
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raise ValueError(f"`top_a` has to be a float >= 0 and <= 1, but is {top_a}")
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self.top_a = top_a
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self.filter_value = filter_value
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self.min_tokens_to_keep = min_tokens_to_keep
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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sorted_logits, sorted_indices = torch.sort(scores, descending=True)
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probs = sorted_logits.softmax(dim=-1)
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# Remove tokens with probability less than top_a*(max(probs))^2 (token with 0 are kept)
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probs_max = probs[..., 0, None]
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sorted_indices_to_remove = probs < probs_max * probs_max * self.top_a
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if self.min_tokens_to_keep > 1:
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# Keep at least min_tokens_to_keep
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sorted_indices_to_remove[..., : self.min_tokens_to_keep] = 0
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indices_to_remove = sorted_indices_to_remove.scatter(1, sorted_indices, sorted_indices_to_remove)
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scores = scores.masked_fill(indices_to_remove, self.filter_value)
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return scores
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class DRYLogitsProcessor(LogitsProcessor):
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def __init__(self, multiplier: float, base: float, allowed_length: int, sequence_breakers: set[int], _range: int):
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self.multiplier = multiplier
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self.base = base
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self.allowed_length = allowed_length
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self.sequence_breakers = sequence_breakers
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self._range = _range
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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if self._range > 0:
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input_ids = input_ids[:, -self._range:]
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for input_ids_row, scores_row in zip(input_ids, scores):
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# Raw integer must be extracted here to check for set membership.
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last_token = input_ids_row[-1].item()
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if last_token in self.sequence_breakers:
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continue
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# Exclude the last token as it always matches.
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match_indices = (input_ids_row[:-1] == last_token).nonzero()
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# Stores the maximum matching sequence length
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# for each token immediately following the sequence in the input.
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match_lengths = {}
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for i in match_indices:
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next_token = input_ids_row[i+1].item()
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if next_token in self.sequence_breakers:
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continue
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# We have already found that `last_token` matches at this index,
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# so the match is at least of length 1.
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match_length = 1
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# Extend the match backwards as far as possible.
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while True:
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j = i - match_length
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if j < 0:
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# Start of input reached.
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break
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previous_token = input_ids_row[-(match_length+1)].item()
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if input_ids_row[j] != previous_token:
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# Start of match reached.
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break
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if previous_token in self.sequence_breakers:
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# Sequence-breaking token reached.
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break
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match_length += 1
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if next_token in match_lengths:
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match_lengths[next_token] = max(match_length, match_lengths[next_token])
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else:
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match_lengths[next_token] = match_length
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# Apply penalties.
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for token, match_length in match_lengths.items():
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if match_length >= self.allowed_length:
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penalty = self.multiplier * self.base ** (match_length - self.allowed_length)
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scores_row[token] -= penalty
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return scores
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class MirostatLogitsWarper(LogitsWarper):
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def __init__(self, mirostat_mode: int, mirostat_tau: float, mirostat_eta: float, filter_value: float = -float("Inf"), min_tokens_to_keep: int = 1):
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if mirostat_mode not in [2]:
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raise ValueError(f"`mirostat` has to be a an integer 2, but is {mirostat_mode}")
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self.mirostat_mode = mirostat_mode
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self.mirostat_eta = mirostat_eta
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self.mirostat_tau = mirostat_tau
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self.filter_value = filter_value
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self.min_tokens_to_keep = min_tokens_to_keep
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self.mu = 2 * self.mirostat_tau
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self.e = 0
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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logits = scores[0]
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sorted_logits, sorted_indices = torch.sort(logits, descending=True)
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prob_original = torch.softmax(sorted_logits, dim=-1).tolist() # candidates
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# Truncate the words with surprise values greater than mu
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for i, candidate in enumerate(prob_original):
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if candidate > 0 and -math.log2(candidate) > self.mu:
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if (i == 0):
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sorted_logits = sorted_logits[:1]
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else:
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sorted_logits = sorted_logits[:i]
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break
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# Normalize the probabilities of the remaining words
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if is_torch_xpu_available():
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prob_topk = torch.softmax(sorted_logits, dim=0).to("xpu")
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prev_i = torch.multinomial(prob_topk, num_samples=1, replacement=True).to("xpu")
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else:
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prob_topk = torch.softmax(sorted_logits, dim=0).to('cuda')
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prev_i = torch.multinomial(prob_topk, num_samples=1, replacement=True).to('cuda')
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observed_surprise = -math.log2(prob_topk[prev_i])
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self.e = observed_surprise - self.mirostat_tau
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# Update mu using the learning rate and error
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self.mu -= self.mirostat_eta * self.e
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sorted_indices_to_remove = torch.ones_like(scores[0], dtype=torch.bool)
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sorted_indices_to_remove[prev_i] = False
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indices_to_remove = sorted_indices_to_remove.unsqueeze(0).scatter(1, sorted_indices.unsqueeze(0), sorted_indices_to_remove.unsqueeze(0))
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scores = scores.masked_fill(indices_to_remove, self.filter_value)
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return scores
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class SpyLogitsWarper(LogitsWarper):
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def __init__(self):
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pass
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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global global_scores
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global_scores = scores
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return scores
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class RepetitionPenaltyLogitsProcessorWithRange(LogitsProcessor):
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'''
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Copied from the transformers library
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'''
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def __init__(self, penalty: float, presence_penalty: float, frequency_penalty: float, _range: int):
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if not (penalty > 0):
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raise ValueError(f"`penalty` has to be strictly positive, but is {penalty}")
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self.penalty = penalty
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self.presence_penalty = presence_penalty
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self.frequency_penalty = frequency_penalty
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self._range = _range
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def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
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input_ids = input_ids[:, -self._range:]
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# We loop here because torch.unique() needs to process each row separately in the
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# case that batch_size > 1.
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for input_ids_row, scores_row in zip(input_ids, scores):
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unique_ids, counts = torch.unique(input_ids_row, return_counts=True)
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score = torch.gather(scores_row, 0, unique_ids)
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# multiplicative repetition penalty
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# if score < 0 then repetition penalty has to be multiplied to reduce the previous token probability
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score = torch.where(score < 0, score * self.penalty, score / self.penalty)
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scores_row.scatter_(0, unique_ids, score)
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# presence_penalty and frequency_penalty
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raw_presence_penalty = (counts > 0).to(scores.dtype)
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raw_frequency_penalty = counts.to(scores.dtype)
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additive_penalty = raw_presence_penalty * self.presence_penalty + raw_frequency_penalty * self.frequency_penalty
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scores_row.scatter_add_(0, unique_ids, -additive_penalty)
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return scores
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def get_logits_warper_patch(self, generation_config):
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# Parameter sanitization
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if isinstance(generation_config.temperature, int):
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generation_config.temperature = float(generation_config.temperature) # Must be float
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# Get the original warpers
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warpers = self._get_logits_warper_old(generation_config)
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# Replace temperature with our modified class.
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# Currently, it behaves identically to the original.
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for i in range(len(warpers)):
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if warpers[i].__class__.__name__ == 'TemperatureLogitsWarper':
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warpers[i] = TemperatureLogitsWarperCustom(
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generation_config.temperature,
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)
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# Add custom warpers
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warpers_to_add = LogitsProcessorList()
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min_tokens_to_keep = 2 if generation_config.num_beams > 1 else 1
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if generation_config.tfs is not None and 0.0 <= generation_config.tfs < 1.0:
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warpers_to_add.append(
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TailFreeLogitsWarper(
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tfs=generation_config.tfs,
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min_tokens_to_keep=min_tokens_to_keep
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)
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)
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if generation_config.top_a is not None and 0.0 < generation_config.top_a <= 1.0:
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warpers_to_add.append(
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TopALogitsWarper(
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top_a=generation_config.top_a,
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min_tokens_to_keep=min_tokens_to_keep
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)
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)
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if generation_config.min_p is not None and 0.0 < generation_config.min_p <= 1.0:
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warpers_to_add.append(
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MinPLogitsWarper(
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min_p=generation_config.min_p,
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min_tokens_to_keep=min_tokens_to_keep
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)
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)
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if generation_config.dynamic_temperature:
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warpers_to_add.append(
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DynamicTemperatureLogitsWarper(
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dynatemp_low=generation_config.dynatemp_low,
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dynatemp_high=generation_config.dynatemp_high,
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dynatemp_exponent=generation_config.dynatemp_exponent,
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)
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)
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if generation_config.smoothing_factor > 0:
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warpers_to_add.append(
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QuadraticSamplingLogitsWarper(
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smoothing_factor=generation_config.smoothing_factor,
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smoothing_curve=generation_config.smoothing_curve
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)
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)
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if generation_config.mirostat_mode is not None and generation_config.mirostat_mode == 2:
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warpers_to_add.append(
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MirostatLogitsWarper(
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mirostat_mode=generation_config.mirostat_mode,
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mirostat_eta=generation_config.mirostat_eta,
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mirostat_tau=generation_config.mirostat_tau,
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min_tokens_to_keep=min_tokens_to_keep
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)
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|
)
|
|
|
|
if len(warpers) > 0 and isinstance(warpers[-1], LogitNormalization):
|
|
normalize = warpers.pop(-1)
|
|
else:
|
|
normalize = None
|
|
|
|
warpers += warpers_to_add
|
|
|
|
# Sort the samplers.
|
|
sampler_priority = generation_config.sampler_priority
|
|
|
|
# Handle temperature_last
|
|
if generation_config.temperature_last:
|
|
for param_name in ['temperature', 'dynamic_temperature', 'quadratic_sampling']:
|
|
if param_name in sampler_priority:
|
|
if param_name in sampler_priority:
|
|
index = sampler_priority.index(param_name)
|
|
sampler_priority.append(sampler_priority.pop(index))
|
|
else:
|
|
sampler_priority.append(param_name)
|
|
|
|
class_name_to_nickname = {
|
|
'DynamicTemperatureLogitsWarper': 'dynamic_temperature',
|
|
'EpsilonLogitsWarper': 'epsilon_cutoff',
|
|
'EtaLogitsWarper': 'eta_cutoff',
|
|
'MinPLogitsWarper': 'min_p',
|
|
'MirostatLogitsWarper': 'mirostat',
|
|
'QuadraticSamplingLogitsWarper': 'quadratic_sampling',
|
|
'TailFreeLogitsWarper': 'tfs',
|
|
'TemperatureLogitsWarperCustom': 'temperature',
|
|
'TopALogitsWarper': 'top_a',
|
|
'TopKLogitsWarper': 'top_k',
|
|
'TopPLogitsWarper': 'top_p',
|
|
'TypicalLogitsWarper': 'typical_p'
|
|
}
|
|
|
|
def custom_sort_key(obj):
|
|
class_name = obj.__class__.__name__
|
|
|
|
# Return a large value if class name is not mapped or if the mapped nickname is not in priority
|
|
if class_name not in class_name_to_nickname or class_name_to_nickname[class_name] not in sampler_priority:
|
|
return float('inf')
|
|
|
|
# Return the index of the nickname in the priority list for sorting
|
|
return sampler_priority.index(class_name_to_nickname[class_name])
|
|
|
|
# Sort the list using the custom key function
|
|
warpers = sorted(warpers, key=custom_sort_key)
|
|
if shared.args.verbose:
|
|
logger.info("WARPERS=")
|
|
pprint.PrettyPrinter(indent=4, sort_dicts=False).pprint([x.__class__.__name__ for x in warpers])
|
|
print()
|
|
|
|
if normalize is not None:
|
|
warpers.append(normalize)
|
|
|
|
warpers.append(SpyLogitsWarper())
|
|
warpers = LogitsProcessorList(warpers)
|
|
return warpers
|
|
|
|
|
|
def get_logits_processor_patch(self, **kwargs):
|
|
generation_config = kwargs['generation_config']
|
|
|
|
do_rep_pen_hijack = (generation_config.repetition_penalty > 1) or (generation_config.presence_penalty != 0) or (generation_config.frequency_penalty != 0)
|
|
if do_rep_pen_hijack:
|
|
generation_config.repetition_penalty = 1.1 # Set to value > 1 to ensure RepetitionPenaltyLogitsProcessor is created
|
|
|
|
result = self._get_logits_processor_old(**kwargs)
|
|
|
|
if do_rep_pen_hijack:
|
|
for i in range(len(result)):
|
|
if result[i].__class__.__name__ == 'RepetitionPenaltyLogitsProcessor':
|
|
result[i] = RepetitionPenaltyLogitsProcessorWithRange(
|
|
generation_config.repetition_penalty,
|
|
generation_config.presence_penalty,
|
|
generation_config.frequency_penalty,
|
|
generation_config.repetition_penalty_range
|
|
)
|
|
|
|
if generation_config.dry_multiplier is not None and generation_config.dry_multiplier > 0.0:
|
|
dry_sequence_breakers = generation_config.dry_sequence_breakers
|
|
|
|
# Support both JSON array notation and comma-separated strings.
|
|
if not dry_sequence_breakers.startswith("["):
|
|
dry_sequence_breakers = "[" + dry_sequence_breakers + "]"
|
|
|
|
sequence_breaker_strings = json.loads(dry_sequence_breakers)
|
|
# Prefix with 'a' to get the correct encoding of the token at the end of a text.
|
|
sequence_breakers = {shared.tokenizer.encode(f'a{s}')[-1] for s in sequence_breaker_strings}
|
|
|
|
result.append(
|
|
DRYLogitsProcessor(
|
|
multiplier=generation_config.dry_multiplier,
|
|
base=generation_config.dry_base,
|
|
allowed_length=generation_config.dry_allowed_length,
|
|
sequence_breakers=sequence_breakers,
|
|
_range=generation_config.repetition_penalty_range,
|
|
)
|
|
)
|
|
|
|
return result
|
|
|
|
|
|
def generation_config_init_patch(self, **kwargs):
|
|
self.__init___old(**kwargs)
|
|
self.min_p = kwargs.pop("min_p", 0.0)
|
|
self.dynamic_temperature = kwargs.pop("dynamic_temperature", False)
|
|
self.dynatemp_low = kwargs.pop("dynatemp_low", 1)
|
|
self.dynatemp_high = kwargs.pop("dynatemp_high", 1)
|
|
self.dynatemp_exponent = kwargs.pop("dynatemp_exponent", 1)
|
|
self.smoothing_factor = kwargs.pop("smoothing_factor", 0.0)
|
|
self.smoothing_curve = kwargs.pop("smoothing_curve", 1.0)
|
|
self.tfs = kwargs.pop("tfs", 1.0)
|
|
self.top_a = kwargs.pop("top_a", 0.0)
|
|
self.mirostat_mode = kwargs.pop("mirostat_mode", 0)
|
|
self.mirostat_eta = kwargs.pop("mirostat_eta", 0.1)
|
|
self.mirostat_tau = kwargs.pop("mirostat_tau", 5)
|
|
self.repetition_penalty_range = kwargs.pop("repetition_penalty_range", 0)
|
|
self.presence_penalty = kwargs.pop("presence_penalty", 0)
|
|
self.frequency_penalty = kwargs.pop("frequency_penalty", 0)
|
|
self.dry_multiplier = kwargs.pop("dry_multiplier", 0.0)
|
|
self.dry_base = kwargs.pop("dry_base", 1.75)
|
|
self.dry_allowed_length = kwargs.pop("dry_allowed_length", 2)
|
|
self.dry_sequence_breakers = kwargs.pop("dry_sequence_breakers", '"\\n", ":", "\\"", "*"')
|
|
self.temperature_last = kwargs.pop("temperature_last", False)
|
|
self.sampler_priority = kwargs.pop("sampler_priority", ['temperature', 'dynamic_temperature', 'quadratic_sampling', 'top_k', 'top_p', 'typical_p', 'epsilon_cutoff', 'eta_cutoff', 'tfs', 'top_a', 'min_p', 'mirostat'])
|
|
|
|
|
|
def hijack_samplers():
|
|
transformers.GenerationMixin._get_logits_warper_old = transformers.GenerationMixin._get_logits_warper
|
|
transformers.GenerationMixin._get_logits_warper = get_logits_warper_patch
|
|
|
|
transformers.GenerationMixin._get_logits_processor_old = transformers.GenerationMixin._get_logits_processor
|
|
transformers.GenerationMixin._get_logits_processor = get_logits_processor_patch
|
|
|
|
transformers.GenerationConfig.__init___old = transformers.GenerationConfig.__init__
|
|
transformers.GenerationConfig.__init__ = generation_config_init_patch
|