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Edited: Let $f:X\to B$ be a holomorphic fibre space of smooth projective varieties which is relatively semi-ample and take $\mu$ as $m$-th root of holomorphic section of direct image of relative line bundle $f_*(K_{X/B}^{\otimes m})$ then why $\mu$ is a family of canonical forms on a family of cyclic $m$ covers of fibres $X_b$ , where $b\in B$.

Question edited after the answer of Sándor Kovács:

Let $f:X\to B$ be a holomorphic fibre space of smooth projective varieties which $f$ is relatively semi-ample and take $\mu$ as $m$-th root of holomorphic section of direct image of relative line bundle $f_*(K_{X/B}^{\otimes m})$ then why $\mu$ must be a family of canonical forms on a family of cyclic $m$ covers of fibres $X_b$ , where $b\in B$.

Let $f:X\to B$ be a holomorphic fibre space of smooth projective varieties and take $\mu$ as $m$-th root of holomorphic section of direct image of relative line bundle $f_*(K_{X/B}^{\otimes m})$ then why $\mu$ is a family of canonical forms on a family of cyclic $m$ covers of fibres $X_b$ , where $b\in B$.

Edited: Let $f:X\to B$ be a holomorphic fibre space of smooth projective varieties which is relatively semi-ample and take $\mu$ as $m$-th root of holomorphic section of direct image of relative line bundle $f_*(K_{X/B}^{\otimes m})$ then why $\mu$ is a family of canonical forms on a family of cyclic $m$ covers of fibres $X_b$ , where $b\in B$.

Let $f:X\to B$ be a holomorphic fibre space of smooth projective varieties and take $\mu$ as $m$-th root of holomorphic section of direct image of relative line bundle $f_*(K_{X/B}^{\otimes m})$ then why $\mu$ is a family of canonical forms on a family of cyclic $m$ covers of fibres $X_b$ , where $b\in B$.

Let $f:X\to B$ be a holomorphic fibre space of smooth projective varieties and take $\mu$ as $m$-th root of holomorphic section of direct image of relative line bundle $f_*(K_{X/B}^{\otimes m})$ then why $\mu$ is a family of canonical forms on a family of cyclic $m$ covers of fibres $X_b$ , where $b\in B$.