  Initial conditions are required to solve medium modified DGLAP (mDGLAP)
evolution equations for modified fragmentation functions due to multiple
scatterings and parton energy loss. Such initial conditions should in principle
include energy loss for partons at scale $Q_0$ above which mDGLAP evolution
equations can be applied. Several models for the initial condition motivated by
induced gluon bremsstrahlung in perturbative QCD are used to calculate the
modified fragmentation functions in nuclear medium and to extract the jet
transport parameter $\hat q$ from fits to experimental data in deeply inelastic
scattering (DIS) off nuclei. The model with a Poisson convolution of multiple
gluon emissions is found to provide the overall best $\chi^2$/d.o.f. fit to the
HERMES data and gives a value of $\hat q_0 \approx 0.020 \pm 0.005$ GeV$^2$/fm
at the center of a large nucleus.
