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Deep Gaussian processes for music mood estimation and retrieval with locally aggregated acoustic Fisher vector

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Abstract

Due to the subjective nature of music mood, it is challenging to computationally model the affective content of the music. In this work, we propose novel features known as locally aggregated acoustic Fisher vectors based on the Fisher kernel paradigm. To preserve the temporal context, onset-detected variable-length segments of the audio songs are obtained, for which a variational Bayesian approach is used to learn the universal background Gaussian mixture model (GMM) representation of the standard acoustic features. The local Fisher vectors obtained with the soft assignment of GMM are aggregated to obtain a better performance relative to the global Fisher vector. A deep Gaussian process (DGP) regression model inspired by the deep learning architectures is proposed to learn the mapping between the proposed Fisher vector features and the mood dimensions of valence and arousal. Since the exact inference on DGP is intractable, the pseudo-data approximation is used to reduce the training complexity and the Monte Carlo sampling technique is used to solve the intractability problem during training. A detailed derivation of a 3-layer DGP is presented that can be easily generalized to an L-layer DGP. The proposed work is evaluated on the PMEmo dataset containing valence and arousal annotations of Western popular music and achieves an improvement in \(R^2\) of \(25\%\) for arousal and \(52\%\) for valence for music mood estimation and an improvement in the Gamma statistic of \(68\%\) for music mood retrieval relative to the baseline single-layer Gaussian process.

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Correspondence to Santosh Chapaneri.

Appendix

Appendix

(i) The expected value of the Fisher score with respect to the UBM-GMM model is zero as shown in Eq. (32):

(32)

(ii) Due to the use of ML estimation approach, the second integral of Eq. (14) is zero as shown in Eq. (33):

$$\begin{aligned}&\nabla _{{\varvec{\Theta }}} \int _{\mathbf {v}} p(\mathbf {v}|{\varvec{\Theta }}) \log p(\mathbf {v} | {\varvec{\Theta }}) \, d\mathbf {v} = \int _{\mathbf {v}} \nabla _{{\varvec{\Theta }}} \log p(\mathbf {v} | {\varvec{\Theta }}) p(\mathbf {v}|{\varvec{\Theta }}) \, d\mathbf {v} \nonumber \\&\quad = \int _{\mathbf {v}} \frac{\nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }}) }{p(\mathbf {v} | {\varvec{\Theta }}) } p(\mathbf {v}|{\varvec{\Theta }}) \, d\mathbf {v} = \int _{\mathbf {v}} \nabla _{{\varvec{\Theta }}} p(\mathbf {v}|{\varvec{\Theta }}) \, d\mathbf {v} \nonumber \\&\quad = \nabla _{{\varvec{\Theta }}} \int _{\mathbf {v}} p(\mathbf {v}|{\varvec{\Theta }}) \, d\mathbf {v} = \nabla _{{\varvec{\Theta }}} 1 = 0. \end{aligned}$$
(33)

(iii) The FIM \(\mathbf {F}_{{\varvec{\Theta }}}\) is equivalent to the negative expected Hessian of the model’s log-likelihood as shown in Eq. (35). Since the Hessian can be written as the Jacobian of the gradient, we have

$$\begin{aligned} H_{\log p(\mathbf {v} | {\varvec{\Theta }})}&= J \left( \nabla _{{\varvec{\Theta }}} \log p(\mathbf {v} | {\varvec{\Theta }}) \right) \nonumber \\&= J \left( \frac{\nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }}) }{p(\mathbf {v} | {\varvec{\Theta }}) } \right) \nonumber \\&= \frac{H_{p(\mathbf {v} | {\varvec{\Theta }})} p(\mathbf {v} | {\varvec{\Theta }}) - \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }}) \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }})^{\intercal } }{ p(\mathbf {v} | {\varvec{\Theta }}) p(\mathbf {v} | {\varvec{\Theta }}) } \nonumber \\&= \frac{H_{p(\mathbf {v} | {\varvec{\Theta }})} p(\mathbf {v} | {\varvec{\Theta }}) }{ p(\mathbf {v} | {\varvec{\Theta }}) p(\mathbf {v} | {\varvec{\Theta }}) } - \frac{ \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }}) \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }})^{\intercal } }{ p(\mathbf {v} | {\varvec{\Theta }}) p(\mathbf {v} | {\varvec{\Theta }}) } \nonumber \\&= \frac{H_{p(\mathbf {v} | {\varvec{\Theta }})} }{ p(\mathbf {v} | {\varvec{\Theta }}) } - \frac{ \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }}) }{ p(\mathbf {v} | {\varvec{\Theta }}) } \left( \frac{ \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }})}{ p(\mathbf {v} | {\varvec{\Theta }}) } \right) ^{\intercal } \end{aligned}$$
(34)

Taking the expectation of Eq. (34) with respect to the UBM-GMM model, we have

$$\begin{aligned}&\mathbb {E}_{\mathbf {v} \sim \text {GMM}_{{\varvec{\Theta }}}} \left[ H_{\log p(\mathbf {v} | {\varvec{\Theta }})} \right] \nonumber \\&\quad = \mathbb {E}_{\mathbf {v} \sim \text {GMM}_{{\varvec{\Theta }}}} \left[ \frac{H_{p(\mathbf {v} | {\varvec{\Theta }})} }{ p(\mathbf {v} | {\varvec{\Theta }}) } \right] - \mathbb {E}_{\mathbf {v} \sim \text {GMM}_{{\varvec{\Theta }}}} \left[ \frac{ \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }}) }{ p(\mathbf {v} | {\varvec{\Theta }}) } \left( \frac{ \nabla _{{\varvec{\Theta }}} p(\mathbf {v} | {\varvec{\Theta }})}{ p(\mathbf {v} | {\varvec{\Theta }}) } \right) ^{\intercal } \right] \nonumber \\&\quad = \int _{\mathbf {v}} \frac{ H_{p(\mathbf {v} | {\varvec{\Theta }}) } }{ p(\mathbf {v} | {\varvec{\Theta }}) } p(\mathbf {v} | {\varvec{\Theta }}) \, d \mathbf {v} - \nonumber \\&\quad \, \mathbb {E}_{\mathbf {v} \sim \text {GMM}_{{\varvec{\Theta }}}} \left[ \nabla _{{\varvec{\Theta }}} \log p(\mathbf {v} | {\varvec{\Theta }}) \cdot \nabla _{{\varvec{\Theta }}} \log p(\mathbf {v} | {\varvec{\Theta }})^{\intercal } \right] \nonumber \\&\quad = H_{ \int _{\mathbf {v}} p(\mathbf {v} | {\varvec{\Theta }}) \, d \mathbf {v} } - \mathbf {F}_{{\varvec{\Theta }}} \nonumber \\&\quad = H_1 - \mathbf {F}_{{\varvec{\Theta }}} = -\mathbf {F}_{{\varvec{\Theta }}}. \nonumber \\&\quad \therefore \mathbf {F}_{{\varvec{\Theta }}} = - \mathbb {E}_{\mathbf {v} \sim \text {GMM}_{{\varvec{\Theta }}}} \left[ H_{\log p(\mathbf {v} | {\varvec{\Theta }})} \right] . \end{aligned}$$
(35)

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Chapaneri, S., Jayaswal, D. Deep Gaussian processes for music mood estimation and retrieval with locally aggregated acoustic Fisher vector. Sādhanā 45, 73 (2020). https://doi.org/10.1007/s12046-020-1313-8

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