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# SPDX-FileCopyrightText: Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved. | |
# SPDX-License-Identifier: MIT | |
# | |
# Permission is hereby granted, free of charge, to any person obtaining a | |
# copy of this software and associated documentation files (the "Software"), | |
# to deal in the Software without restriction, including without limitation | |
# the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
# and/or sell copies of the Software, and to permit persons to whom the | |
# Software is furnished to do so, subject to the following conditions: | |
# | |
# The above copyright notice and this permission notice shall be included in | |
# all copies or substantial portions of the Software. | |
# | |
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
# DEALINGS IN THE SOFTWARE. | |
import numpy as np | |
from numba import jit | |
def mas_width1(attn_map): | |
"""mas with hardcoded width=1""" | |
# assumes mel x text | |
opt = np.zeros_like(attn_map) | |
attn_map = np.log(attn_map) | |
attn_map[0, 1:] = -np.inf | |
log_p = np.zeros_like(attn_map) | |
log_p[0, :] = attn_map[0, :] | |
prev_ind = np.zeros_like(attn_map, dtype=np.int64) | |
for i in range(1, attn_map.shape[0]): | |
for j in range(attn_map.shape[1]): # for each text dim | |
prev_log = log_p[i - 1, j] | |
prev_j = j | |
if j - 1 >= 0 and log_p[i - 1, j - 1] >= log_p[i - 1, j]: | |
prev_log = log_p[i - 1, j - 1] | |
prev_j = j - 1 | |
log_p[i, j] = attn_map[i, j] + prev_log | |
prev_ind[i, j] = prev_j | |
# now backtrack | |
curr_text_idx = attn_map.shape[1] - 1 | |
for i in range(attn_map.shape[0] - 1, -1, -1): | |
opt[i, curr_text_idx] = 1 | |
curr_text_idx = prev_ind[i, curr_text_idx] | |
opt[0, curr_text_idx] = 1 | |
return opt | |